/abc/
    abc
 0: abc
    
/ab*c/
    abc
 0: abc
    abbbbc
 0: abbbbc
    ac
 0: ac
    
/ab+c/
    abc
 0: abc
    abbbbbbc
 0: abbbbbbc
    *** Failers 
No match
    ac
No match
    ab
No match
    
/a*/
    a
 0: a
 1: 
    aaaaaaaaaaaaaaaaa
 0: aaaaaaaaaaaaaaaaa
 1: aaaaaaaaaaaaaaaa
 2: aaaaaaaaaaaaaaa
 3: aaaaaaaaaaaaaa
 4: aaaaaaaaaaaaa
 5: aaaaaaaaaaaa
 6: aaaaaaaaaaa
 7: aaaaaaaaaa
 8: aaaaaaaaa
 9: aaaaaaaa
10: aaaaaaa
11: aaaaaa
12: aaaaa
13: aaaa
14: aaa
15: aa
16: a
17: 
    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
Matched, but too many subsidiary matches
 0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
 1: aaaaaaaaaaaaaaaaaaaaaaaaaaaaa
 2: aaaaaaaaaaaaaaaaaaaaaaaaaaaa
 3: aaaaaaaaaaaaaaaaaaaaaaaaaaa
 4: aaaaaaaaaaaaaaaaaaaaaaaaaa
 5: aaaaaaaaaaaaaaaaaaaaaaaaa
 6: aaaaaaaaaaaaaaaaaaaaaaaa
 7: aaaaaaaaaaaaaaaaaaaaaaa
 8: aaaaaaaaaaaaaaaaaaaaaa
 9: aaaaaaaaaaaaaaaaaaaaa
10: aaaaaaaaaaaaaaaaaaaa
11: aaaaaaaaaaaaaaaaaaa
12: aaaaaaaaaaaaaaaaaa
13: aaaaaaaaaaaaaaaaa
14: aaaaaaaaaaaaaaaa
15: aaaaaaaaaaaaaaa
16: aaaaaaaaaaaaaa
17: aaaaaaaaaaaaa
18: aaaaaaaaaaaa
19: aaaaaaaaaaa
20: aaaaaaaaaa
21: aaaaaaaaa
    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\F 
 0: 
    
/(a|abcd|african)/
    a
 0: a
    abcd
 0: abcd
 1: a
    african
 0: african
 1: a
    
/^abc/
    abcdef
 0: abc
    *** Failers
No match
    xyzabc
No match
    xyz\nabc    
No match
    
/^abc/m
    abcdef
 0: abc
    xyz\nabc    
 0: abc
    *** Failers
No match
    xyzabc
No match
    
/\Aabc/
    abcdef
 0: abc
    *** Failers
No match
    xyzabc
No match
    xyz\nabc    
No match
    
/\Aabc/m
    abcdef
 0: abc
    *** Failers
No match
    xyzabc
No match
    xyz\nabc    
No match
    
/\Gabc/
    abcdef
 0: abc
    xyzabc\>3
 0: abc
    *** Failers
No match
    xyzabc    
No match
    xyzabc\>2 
No match
    
/x\dy\Dz/
    x9yzz
 0: x9yzz
    x0y+z
 0: x0y+z
    *** Failers
No match
    xyz
No match
    xxy0z     
No match
    
/x\sy\Sz/
    x yzz
 0: x yzz
    x y+z
 0: x y+z
    *** Failers
No match
    xyz
No match
    xxyyz
No match
    
/x\wy\Wz/
    xxy+z
 0: xxy+z
    *** Failers
No match
    xxy0z
No match
    x+y+z         
No match
    
/x.y/
    x+y
 0: x+y
    x-y
 0: x-y
    *** Failers
No match
    x\ny
No match
    
/x.y/s
    x+y
 0: x+y
    x-y
 0: x-y
    x\ny
 0: x\x0ay

/(a.b(?s)c.d|x.y)p.q/
    a+bc+dp+q
 0: a+bc+dp+q
    a+bc\ndp+q
 0: a+bc\x0adp+q
    x\nyp+q 
 0: x\x0ayp+q
    *** Failers 
No match
    a\nbc\ndp+q
No match
    a+bc\ndp\nq
No match
    x\nyp\nq 
No match

/a\d\z/
    ba0
 0: a0
    *** Failers
No match
    ba0\n
No match
    ba0\ncd   
No match

/a\d\z/m
    ba0
 0: a0
    *** Failers
No match
    ba0\n
No match
    ba0\ncd   
No match

/a\d\Z/
    ba0
 0: a0
    ba0\n
 0: a0
    *** Failers
No match
    ba0\ncd   
No match

/a\d\Z/m
    ba0
 0: a0
    ba0\n
 0: a0
    *** Failers
No match
    ba0\ncd   
No match

/a\d$/
    ba0
 0: a0
    ba0\n
 0: a0
    *** Failers
No match
    ba0\ncd   
No match

/a\d$/m
    ba0
 0: a0
    ba0\n
 0: a0
    ba0\ncd   
 0: a0
    *** Failers
No match

/abc/i
    abc
 0: abc
    aBc
 0: aBc
    ABC
 0: ABC
    
/[^a]/
    abcd
 0: b
    
/ab?\w/
    abz
 0: abz
 1: ab
    abbz
 0: abb
 1: ab
    azz  
 0: az

/x{0,3}yz/
    ayzq
 0: yz
    axyzq
 0: xyz
    axxyz
 0: xxyz
    axxxyzq
 0: xxxyz
    axxxxyzq
 0: xxxyz
    *** Failers
No match
    ax
No match
    axx     
No match
      
/x{3}yz/
    axxxyzq
 0: xxxyz
    axxxxyzq
 0: xxxyz
    *** Failers
No match
    ax
No match
    axx     
No match
    ayzq
No match
    axyzq
No match
    axxyz
No match
      
/x{2,3}yz/
    axxyz
 0: xxyz
    axxxyzq
 0: xxxyz
    axxxxyzq
 0: xxxyz
    *** Failers
No match
    ax
No match
    axx     
No match
    ayzq
No match
    axyzq
No match
      
/[^a]+/
    bac
 0: b
    bcdefax
 0: bcdef
 1: bcde
 2: bcd
 3: bc
 4: b
    *** Failers
 0: *** F
 1: *** 
 2: ***
 3: **
 4: *
    aaaaa   
No match

/[^a]*/
    bac
 0: b
 1: 
    bcdefax
 0: bcdef
 1: bcde
 2: bcd
 3: bc
 4: b
 5: 
    *** Failers
 0: *** F
 1: *** 
 2: ***
 3: **
 4: *
 5: 
    aaaaa   
 0: 
    
/[^a]{3,5}/
    xyz
 0: xyz
    awxyza
 0: wxyz
 1: wxy
    abcdefa
 0: bcdef
 1: bcde
 2: bcd
    abcdefghijk
 0: bcdef
 1: bcde
 2: bcd
    *** Failers
 0: *** F
 1: *** 
 2: ***
    axya
No match
    axa
No match
    aaaaa         
No match

/\d*/
    1234b567
 0: 1234
 1: 123
 2: 12
 3: 1
 4: 
    xyz
 0: 
    
/\D*/
    a1234b567
 0: a
 1: 
    xyz
 0: xyz
 1: xy
 2: x
 3: 
     
/\d+/
    ab1234c56
 0: 1234
 1: 123
 2: 12
 3: 1
    *** Failers
No match
    xyz
No match
    
/\D+/
    ab123c56
 0: ab
 1: a
    *** Failers
 0: *** Failers
 1: *** Failer
 2: *** Faile
 3: *** Fail
 4: *** Fai
 5: *** Fa
 6: *** F
 7: *** 
 8: ***
 9: **
10: *
    789
No match
    
/\d?A/
    045ABC
 0: 5A
    ABC
 0: A
    *** Failers
No match
    XYZ
No match
    
/\D?A/
    ABC
 0: A
    BAC
 0: BA
    9ABC             
 0: A
    *** Failers
No match

/a+/
    aaaa
 0: aaaa
 1: aaa
 2: aa
 3: a

/^.*xyz/
    xyz
 0: xyz
    ggggggggxyz
 0: ggggggggxyz
    
/^.+xyz/
    abcdxyz
 0: abcdxyz
    axyz
 0: axyz
    *** Failers
No match
    xyz
No match
    
/^.?xyz/
    xyz
 0: xyz
    cxyz       
 0: cxyz

/^\d{2,3}X/
    12X
 0: 12X
    123X
 0: 123X
    *** Failers
No match
    X
No match
    1X
No match
    1234X     
No match

/^[abcd]\d/
    a45
 0: a4
    b93
 0: b9
    c99z
 0: c9
    d04
 0: d0
    *** Failers
No match
    e45
No match
    abcd      
No match
    abcd1234
No match
    1234  
No match

/^[abcd]*\d/
    a45
 0: a4
    b93
 0: b9
    c99z
 0: c9
    d04
 0: d0
    abcd1234
 0: abcd1
    1234  
 0: 1
    *** Failers
No match
    e45
No match
    abcd      
No match

/^[abcd]+\d/
    a45
 0: a4
    b93
 0: b9
    c99z
 0: c9
    d04
 0: d0
    abcd1234
 0: abcd1
    *** Failers
No match
    1234  
No match
    e45
No match
    abcd      
No match

/^a+X/
    aX
 0: aX
    aaX 
 0: aaX

/^[abcd]?\d/
    a45
 0: a4
    b93
 0: b9
    c99z
 0: c9
    d04
 0: d0
    1234  
 0: 1
    *** Failers
No match
    abcd1234
No match
    e45
No match

/^[abcd]{2,3}\d/
    ab45
 0: ab4
    bcd93
 0: bcd9
    *** Failers
No match
    1234 
No match
    a36 
No match
    abcd1234
No match
    ee45
No match

/^(abc)*\d/
    abc45
 0: abc4
    abcabcabc45
 0: abcabcabc4
    42xyz 
 0: 4
    *** Failers
No match

/^(abc)+\d/
    abc45
 0: abc4
    abcabcabc45
 0: abcabcabc4
    *** Failers
No match
    42xyz 
No match

/^(abc)?\d/
    abc45
 0: abc4
    42xyz 
 0: 4
    *** Failers
No match
    abcabcabc45
No match

/^(abc){2,3}\d/
    abcabc45
 0: abcabc4
    abcabcabc45
 0: abcabcabc4
    *** Failers
No match
    abcabcabcabc45
No match
    abc45
No match
    42xyz 
No match

/1(abc|xyz)2(?1)3/
    1abc2abc3456
 0: 1abc2abc3
    1abc2xyz3456 
 0: 1abc2xyz3

/^(a*\w|ab)=(a*\w|ab)/
    ab=ab
 0: ab=ab
 1: ab=a

/^(a*\w|ab)=(?1)/
    ab=ab
 0: ab=ab

/^([^()]|\((?1)*\))*$/
    abc
 0: abc
    a(b)c
 0: a(b)c
    a(b(c))d  
 0: a(b(c))d
    *** Failers)
No match
    a(b(c)d  
No match

/^>abc>([^()]|\((?1)*\))*<xyz<$/
    >abc>123<xyz<
 0: >abc>123<xyz<
    >abc>1(2)3<xyz<
 0: >abc>1(2)3<xyz<
    >abc>(1(2)3)<xyz<
 0: >abc>(1(2)3)<xyz<

/^(?>a*)\d/
    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa9876
 0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa9
    *** Failers 
No match
    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
No match

/< (?: (?(R) \d++  | [^<>]*+) | (?R)) * >/x
    <>
 0: <>
    <abcd>
 0: <abcd>
    <abc <123> hij>
 0: <abc <123> hij>
    <abc <def> hij>
 0: <def>
    <abc<>def> 
 0: <abc<>def>
    <abc<>      
 0: <>
    *** Failers
No match
    <abc
No match

/^(?(?=abc)\w{3}:|\d\d)$/        
    abc:                          
 0: abc:
    12                             
 0: 12
    *** Failers                     
No match
    123                       
No match
    xyz                        
No match
                                
/^(?(?!abc)\d\d|\w{3}:)$/      
    abc:                        
 0: abc:
    12         
 0: 12
    *** Failers
No match
    123
No match
    xyz    
No match

/^(?=abc)\w{5}:$/        
    abcde:                          
 0: abcde:
    *** Failers                     
No match
    abc.. 
No match
    123                       
No match
    vwxyz                        
No match
                                
/^(?!abc)\d\d$/      
    12         
 0: 12
    *** Failers
No match
    abcde:
No match
    abc..  
No match
    123
No match
    vwxyz    
No match

/(?<=abc|xy)123/
    abc12345
 0: 123
    wxy123z
 0: 123
    *** Failers
No match
    123abc
No match

/(?<!abc|xy)123/
    123abc
 0: 123
    mno123456 
 0: 123
    *** Failers
No match
    abc12345
No match
    wxy123z
No match

/abc(?C1)xyz/
    abcxyz
--->abcxyz
  1 ^  ^       x
 0: abcxyz
    123abcxyz999 
--->123abcxyz999
  1    ^  ^          x
 0: abcxyz

/(ab|cd){3,4}/C
  ababab
--->ababab
 +0 ^          (ab|cd){3,4}
 +1 ^          a
 +4 ^          c
 +2 ^^         b
 +3 ^ ^        |
 +1 ^ ^        a
 +4 ^ ^        c
 +2 ^  ^       b
 +3 ^   ^      |
 +1 ^   ^      a
 +4 ^   ^      c
 +2 ^    ^     b
 +3 ^     ^    |
+12 ^     ^    
 +1 ^     ^    a
 +4 ^     ^    c
 0: ababab
  abcdabcd
--->abcdabcd
 +0 ^            (ab|cd){3,4}
 +1 ^            a
 +4 ^            c
 +2 ^^           b
 +3 ^ ^          |
 +1 ^ ^          a
 +4 ^ ^          c
 +5 ^  ^         d
 +6 ^   ^        )
 +1 ^   ^        a
 +4 ^   ^        c
 +2 ^    ^       b
 +3 ^     ^      |
+12 ^     ^      
 +1 ^     ^      a
 +4 ^     ^      c
 +5 ^      ^     d
 +6 ^       ^    )
+12 ^       ^    
 0: abcdabcd
 1: abcdab
  abcdcdcdcdcd  
--->abcdcdcdcdcd
 +0 ^                (ab|cd){3,4}
 +1 ^                a
 +4 ^                c
 +2 ^^               b
 +3 ^ ^              |
 +1 ^ ^              a
 +4 ^ ^              c
 +5 ^  ^             d
 +6 ^   ^            )
 +1 ^   ^            a
 +4 ^   ^            c
 +5 ^    ^           d
 +6 ^     ^          )
+12 ^     ^          
 +1 ^     ^          a
 +4 ^     ^          c
 +5 ^      ^         d
 +6 ^       ^        )
+12 ^       ^        
 0: abcdcdcd
 1: abcdcd

/^abc/
    abcdef
 0: abc
    *** Failers
No match
    abcdef\B  
No match

/^(a*|xyz)/
    bcd
 0: 
    aaabcd
 0: aaa
 1: aa
 2: a
 3: 
    xyz
 0: xyz
 1: 
    xyz\N  
 0: xyz
    *** Failers
 0: 
    bcd\N   
No match
    
/xyz$/
    xyz
 0: xyz
    xyz\n
 0: xyz
    *** Failers
No match
    xyz\Z
No match
    xyz\n\Z    
No match
    
/xyz$/m
    xyz
 0: xyz
    xyz\n 
 0: xyz
    abcxyz\npqr 
 0: xyz
    abcxyz\npqr\Z 
 0: xyz
    xyz\n\Z    
 0: xyz
    *** Failers
No match
    xyz\Z
No match

/\Gabc/
    abcdef
 0: abc
    defabcxyz\>3 
 0: abc
    *** Failers 
No match
    defabcxyz
No match

/^abcdef/
    ab\P
Partial match: ab
    abcde\P
Partial match: abcde
    abcdef\P
 0: abcdef
    *** Failers
No match
    abx\P    
No match

/^a{2,4}\d+z/
    a\P
Partial match: a
    aa\P
Partial match: aa
    aa2\P 
Partial match: aa2
    aaa\P
Partial match: aaa
    aaa23\P 
Partial match: aaa23
    aaaa12345\P
Partial match: aaaa12345
    aa0z\P
 0: aa0z
    aaaa4444444444444z\P 
 0: aaaa4444444444444z
    *** Failers
No match
    az\P 
No match
    aaaaa\P 
No match
    a56\P 
No match

/^abcdef/
   abc\P
Partial match: abc
   def\R 
 0: def
   
/(?<=foo)bar/
   xyzfo\P 
No match
   foob\P\>2 
Partial match: b
   foobar...\R\P\>4 
 0: ar
   xyzfo\P
No match
   foobar\>2  
 0: bar
   *** Failers
No match
   xyzfo\P
No match
   obar\R   
No match

/(ab*(cd|ef))+X/
    adfadadaklhlkalkajhlkjahdfasdfasdfladsfjkj\P\Z
No match
    lkjhlkjhlkjhlkjhabbbbbbcdaefabbbbbbbefa\P\B\Z
Partial match: abbbbbbcdaefabbbbbbbefa
    cdabbbbbbbb\P\R\B\Z
Partial match: cdabbbbbbbb
    efabbbbbbbbbbbbbbbb\P\R\B\Z
Partial match: efabbbbbbbbbbbbbbbb
    bbbbbbbbbbbbcdXyasdfadf\P\R\B\Z    
 0: bbbbbbbbbbbbcdX

/(a|b)/SF>testsavedregex
Compiled regex written to testsavedregex
Study data written to testsavedregex
<testsavedregex
Compiled regex (byte-inverted) loaded from testsavedregex
Study data loaded from testsavedregex
    abc
 0: a
    ** Failers
 0: a
    def  
No match
    
/the quick brown fox/
    the quick brown fox
 0: the quick brown fox
    The quick brown FOX
No match
    What do you know about the quick brown fox?
 0: the quick brown fox
    What do you know about THE QUICK BROWN FOX?
No match

/The quick brown fox/i
    the quick brown fox
 0: the quick brown fox
    The quick brown FOX
 0: The quick brown FOX
    What do you know about the quick brown fox?
 0: the quick brown fox
    What do you know about THE QUICK BROWN FOX?
 0: THE QUICK BROWN FOX

/abcd\t\n\r\f\a\e\071\x3b\$\\\?caxyz/
    abcd\t\n\r\f\a\e9;\$\\?caxyz
 0: abcd\x09\x0a\x0d\x0c\x07\x1b9;$\?caxyz

/a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz/
    abxyzpqrrrabbxyyyypqAzz
 0: abxyzpqrrrabbxyyyypqAzz
    abxyzpqrrrabbxyyyypqAzz
 0: abxyzpqrrrabbxyyyypqAzz
    aabxyzpqrrrabbxyyyypqAzz
 0: aabxyzpqrrrabbxyyyypqAzz
    aaabxyzpqrrrabbxyyyypqAzz
 0: aaabxyzpqrrrabbxyyyypqAzz
    aaaabxyzpqrrrabbxyyyypqAzz
 0: aaaabxyzpqrrrabbxyyyypqAzz
    abcxyzpqrrrabbxyyyypqAzz
 0: abcxyzpqrrrabbxyyyypqAzz
    aabcxyzpqrrrabbxyyyypqAzz
 0: aabcxyzpqrrrabbxyyyypqAzz
    aaabcxyzpqrrrabbxyyyypAzz
 0: aaabcxyzpqrrrabbxyyyypAzz
    aaabcxyzpqrrrabbxyyyypqAzz
 0: aaabcxyzpqrrrabbxyyyypqAzz
    aaabcxyzpqrrrabbxyyyypqqAzz
 0: aaabcxyzpqrrrabbxyyyypqqAzz
    aaabcxyzpqrrrabbxyyyypqqqAzz
 0: aaabcxyzpqrrrabbxyyyypqqqAzz
    aaabcxyzpqrrrabbxyyyypqqqqAzz
 0: aaabcxyzpqrrrabbxyyyypqqqqAzz
    aaabcxyzpqrrrabbxyyyypqqqqqAzz
 0: aaabcxyzpqrrrabbxyyyypqqqqqAzz
    aaabcxyzpqrrrabbxyyyypqqqqqqAzz
 0: aaabcxyzpqrrrabbxyyyypqqqqqqAzz
    aaaabcxyzpqrrrabbxyyyypqAzz
 0: aaaabcxyzpqrrrabbxyyyypqAzz
    abxyzzpqrrrabbxyyyypqAzz
 0: abxyzzpqrrrabbxyyyypqAzz
    aabxyzzzpqrrrabbxyyyypqAzz
 0: aabxyzzzpqrrrabbxyyyypqAzz
    aaabxyzzzzpqrrrabbxyyyypqAzz
 0: aaabxyzzzzpqrrrabbxyyyypqAzz
    aaaabxyzzzzpqrrrabbxyyyypqAzz
 0: aaaabxyzzzzpqrrrabbxyyyypqAzz
    abcxyzzpqrrrabbxyyyypqAzz
 0: abcxyzzpqrrrabbxyyyypqAzz
    aabcxyzzzpqrrrabbxyyyypqAzz
 0: aabcxyzzzpqrrrabbxyyyypqAzz
    aaabcxyzzzzpqrrrabbxyyyypqAzz
 0: aaabcxyzzzzpqrrrabbxyyyypqAzz
    aaaabcxyzzzzpqrrrabbxyyyypqAzz
 0: aaaabcxyzzzzpqrrrabbxyyyypqAzz
    aaaabcxyzzzzpqrrrabbbxyyyypqAzz
 0: aaaabcxyzzzzpqrrrabbbxyyyypqAzz
    aaaabcxyzzzzpqrrrabbbxyyyyypqAzz
 0: aaaabcxyzzzzpqrrrabbbxyyyyypqAzz
    aaabcxyzpqrrrabbxyyyypABzz
 0: aaabcxyzpqrrrabbxyyyypABzz
    aaabcxyzpqrrrabbxyyyypABBzz
 0: aaabcxyzpqrrrabbxyyyypABBzz
    >>>aaabxyzpqrrrabbxyyyypqAzz
 0: aaabxyzpqrrrabbxyyyypqAzz
    >aaaabxyzpqrrrabbxyyyypqAzz
 0: aaaabxyzpqrrrabbxyyyypqAzz
    >>>>abcxyzpqrrrabbxyyyypqAzz
 0: abcxyzpqrrrabbxyyyypqAzz
    *** Failers
No match
    abxyzpqrrabbxyyyypqAzz
No match
    abxyzpqrrrrabbxyyyypqAzz
No match
    abxyzpqrrrabxyyyypqAzz
No match
    aaaabcxyzzzzpqrrrabbbxyyyyyypqAzz
No match
    aaaabcxyzzzzpqrrrabbbxyyypqAzz
No match
    aaabcxyzpqrrrabbxyyyypqqqqqqqAzz
No match

/^(abc){1,2}zz/
    abczz
 0: abczz
    abcabczz
 0: abcabczz
    *** Failers
No match
    zz
No match
    abcabcabczz
No match
    >>abczz
No match

/^(b+?|a){1,2}?c/
    bc
 0: bc
    bbc
 0: bbc
    bbbc
 0: bbbc
    bac
 0: bac
    bbac
 0: bbac
    aac
 0: aac
    abbbbbbbbbbbc
 0: abbbbbbbbbbbc
    bbbbbbbbbbbac
 0: bbbbbbbbbbbac
    *** Failers
No match
    aaac
No match
    abbbbbbbbbbbac
No match

/^(b+|a){1,2}c/
    bc
 0: bc
    bbc
 0: bbc
    bbbc
 0: bbbc
    bac
 0: bac
    bbac
 0: bbac
    aac
 0: aac
    abbbbbbbbbbbc
 0: abbbbbbbbbbbc
    bbbbbbbbbbbac
 0: bbbbbbbbbbbac
    *** Failers
No match
    aaac
No match
    abbbbbbbbbbbac
No match

/^(b+|a){1,2}?bc/
    bbc
 0: bbc

/^(b*|ba){1,2}?bc/
    babc
 0: babc
    bbabc
 0: bbabc
    bababc
 0: bababc
    *** Failers
No match
    bababbc
No match
    babababc
No match

/^(ba|b*){1,2}?bc/
    babc
 0: babc
    bbabc
 0: bbabc
    bababc
 0: bababc
    *** Failers
No match
    bababbc
No match
    babababc
No match

/^\ca\cA\c[\c{\c:/
    \x01\x01\e;z
 0: \x01\x01\x1b;z

/^[ab\]cde]/
    athing
 0: a
    bthing
 0: b
    ]thing
 0: ]
    cthing
 0: c
    dthing
 0: d
    ething
 0: e
    *** Failers
No match
    fthing
No match
    [thing
No match
    \\thing
No match

/^[]cde]/
    ]thing
 0: ]
    cthing
 0: c
    dthing
 0: d
    ething
 0: e
    *** Failers
No match
    athing
No match
    fthing
No match

/^[^ab\]cde]/
    fthing
 0: f
    [thing
 0: [
    \\thing
 0: \
    *** Failers
 0: *
    athing
No match
    bthing
No match
    ]thing
No match
    cthing
No match
    dthing
No match
    ething
No match

/^[^]cde]/
    athing
 0: a
    fthing
 0: f
    *** Failers
 0: *
    ]thing
No match
    cthing
No match
    dthing
No match
    ething
No match

/^\Б/
    Б
 0: \x81

/^€/
    €
 0: \xff

/^[0-9]+$/
    0
 0: 0
    1
 0: 1
    2
 0: 2
    3
 0: 3
    4
 0: 4
    5
 0: 5
    6
 0: 6
    7
 0: 7
    8
 0: 8
    9
 0: 9
    10
 0: 10
    100
 0: 100
    *** Failers
No match
    abc
No match

/^.*nter/
    enter
 0: enter
    inter
 0: inter
    uponter
 0: uponter

/^xxx[0-9]+$/
    xxx0
 0: xxx0
    xxx1234
 0: xxx1234
    *** Failers
No match
    xxx
No match

/^.+[0-9][0-9][0-9]$/
    x123
 0: x123
    xx123
 0: xx123
    123456
 0: 123456
    *** Failers
No match
    123
No match
    x1234
 0: x1234

/^.+?[0-9][0-9][0-9]$/
    x123
 0: x123
    xx123
 0: xx123
    123456
 0: 123456
    *** Failers
No match
    123
No match
    x1234
 0: x1234

/^([^!]+)!(.+)=apquxz\.ixr\.zzz\.ac\.uk$/
    abc!pqr=apquxz.ixr.zzz.ac.uk
 0: abc!pqr=apquxz.ixr.zzz.ac.uk
    *** Failers
No match
    !pqr=apquxz.ixr.zzz.ac.uk
No match
    abc!=apquxz.ixr.zzz.ac.uk
No match
    abc!pqr=apquxz:ixr.zzz.ac.uk
No match
    abc!pqr=apquxz.ixr.zzz.ac.ukk
No match

/:/
    Well, we need a colon: somewhere
 0: :
    *** Fail if we don't
No match

/([\da-f:]+)$/i
    0abc
 0: 0abc
    abc
 0: abc
    fed
 0: fed
    E
 0: E
    ::
 0: ::
    5f03:12C0::932e
 0: 5f03:12C0::932e
    fed def
 0: def
    Any old stuff
 0: ff
    *** Failers
No match
    0zzz
No match
    gzzz
No match
    fed\x20
No match
    Any old rubbish
No match

/^.*\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/
    .1.2.3
 0: .1.2.3
    A.12.123.0
 0: A.12.123.0
    *** Failers
No match
    .1.2.3333
No match
    1.2.3
No match
    1234.2.3
No match

/^(\d+)\s+IN\s+SOA\s+(\S+)\s+(\S+)\s*\(\s*$/
    1 IN SOA non-sp1 non-sp2(
 0: 1 IN SOA non-sp1 non-sp2(
    1    IN    SOA    non-sp1    non-sp2   (
 0: 1    IN    SOA    non-sp1    non-sp2   (
    *** Failers
No match
    1IN SOA non-sp1 non-sp2(
No match

/^[a-zA-Z\d][a-zA-Z\d\-]*(\.[a-zA-Z\d][a-zA-z\d\-]*)*\.$/
    a.
 0: a.
    Z.
 0: Z.
    2.
 0: 2.
    ab-c.pq-r.
 0: ab-c.pq-r.
    sxk.zzz.ac.uk.
 0: sxk.zzz.ac.uk.
    x-.y-.
 0: x-.y-.
    *** Failers
No match
    -abc.peq.
No match

/^\*\.[a-z]([a-z\-\d]*[a-z\d]+)?(\.[a-z]([a-z\-\d]*[a-z\d]+)?)*$/
    *.a
 0: *.a
    *.b0-a
 0: *.b0-a
    *.c3-b.c
 0: *.c3-b.c
    *.c-a.b-c
 0: *.c-a.b-c
    *** Failers
No match
    *.0
No match
    *.a-
No match
    *.a-b.c-
No match
    *.c-a.0-c
No match

/^(?=ab(de))(abd)(e)/
    abde
 0: abde

/^(?!(ab)de|x)(abd)(f)/
    abdf
 0: abdf

/^(?=(ab(cd)))(ab)/
    abcd
 0: ab

/^[\da-f](\.[\da-f])*$/i
    a.b.c.d
 0: a.b.c.d
    A.B.C.D
 0: A.B.C.D
    a.b.c.1.2.3.C
 0: a.b.c.1.2.3.C

/^\".*\"\s*(;.*)?$/
    \"1234\"
 0: "1234"
    \"abcd\" ;
 0: "abcd" ;
    \"\" ; rhubarb
 0: "" ; rhubarb
    *** Failers
No match
    \"1234\" : things
No match

/^$/
    \
 0: 
    *** Failers
No match

/   ^    a   (?# begins with a)  b\sc (?# then b c) $ (?# then end)/x
    ab c
 0: ab c
    *** Failers
No match
    abc
No match
    ab cde
No match

/(?x)   ^    a   (?# begins with a)  b\sc (?# then b c) $ (?# then end)/
    ab c
 0: ab c
    *** Failers
No match
    abc
No match
    ab cde
No match

/^   a\ b[c ]d       $/x
    a bcd
 0: a bcd
    a b d
 0: a b d
    *** Failers
No match
    abcd
No match
    ab d
No match

/^(a(b(c)))(d(e(f)))(h(i(j)))(k(l(m)))$/
    abcdefhijklm
 0: abcdefhijklm

/^(?:a(b(c)))(?:d(e(f)))(?:h(i(j)))(?:k(l(m)))$/
    abcdefhijklm
 0: abcdefhijklm

/^[\w][\W][\s][\S][\d][\D][\b][\n][\c]][\022]/
    a+ Z0+\x08\n\x1d\x12
 0: a+ Z0+\x08\x0a\x1d\x12

/^[.^$|()*+?{,}]+/
    .^\$(*+)|{?,?}
 0: .^$(*+)|{?,?}
 1: .^$(*+)|{?,?
 2: .^$(*+)|{?,
 3: .^$(*+)|{?
 4: .^$(*+)|{
 5: .^$(*+)|
 6: .^$(*+)
 7: .^$(*+
 8: .^$(*
 9: .^$(
10: .^$
11: .^
12: .

/^a*\w/
    z
 0: z
    az
 0: az
 1: a
    aaaz
 0: aaaz
 1: aaa
 2: aa
 3: a
    a
 0: a
    aa
 0: aa
 1: a
    aaaa
 0: aaaa
 1: aaa
 2: aa
 3: a
    a+
 0: a
    aa+
 0: aa
 1: a

/^a*?\w/
    z
 0: z
    az
 0: az
 1: a
    aaaz
 0: aaaz
 1: aaa
 2: aa
 3: a
    a
 0: a
    aa
 0: aa
 1: a
    aaaa
 0: aaaa
 1: aaa
 2: aa
 3: a
    a+
 0: a
    aa+
 0: aa
 1: a

/^a+\w/
    az
 0: az
    aaaz
 0: aaaz
 1: aaa
 2: aa
    aa
 0: aa
    aaaa
 0: aaaa
 1: aaa
 2: aa
    aa+
 0: aa

/^a+?\w/
    az
 0: az
    aaaz
 0: aaaz
 1: aaa
 2: aa
    aa
 0: aa
    aaaa
 0: aaaa
 1: aaa
 2: aa
    aa+
 0: aa

/^\d{8}\w{2,}/
    1234567890
 0: 1234567890
    12345678ab
 0: 12345678ab
    12345678__
 0: 12345678__
    *** Failers
No match
    1234567
No match

/^[aeiou\d]{4,5}$/
    uoie
 0: uoie
    1234
 0: 1234
    12345
 0: 12345
    aaaaa
 0: aaaaa
    *** Failers
No match
    123456
No match

/^[aeiou\d]{4,5}?/
    uoie
 0: uoie
    1234
 0: 1234
    12345
 0: 12345
 1: 1234
    aaaaa
 0: aaaaa
 1: aaaa
    123456
 0: 12345
 1: 1234

/^From +([^ ]+) +[a-zA-Z][a-zA-Z][a-zA-Z] +[a-zA-Z][a-zA-Z][a-zA-Z] +[0-9]?[0-9] +[0-9][0-9]:[0-9][0-9]/
    From abcd  Mon Sep 01 12:33:02 1997
 0: From abcd  Mon Sep 01 12:33

/^From\s+\S+\s+([a-zA-Z]{3}\s+){2}\d{1,2}\s+\d\d:\d\d/
    From abcd  Mon Sep 01 12:33:02 1997
 0: From abcd  Mon Sep 01 12:33
    From abcd  Mon Sep  1 12:33:02 1997
 0: From abcd  Mon Sep  1 12:33
    *** Failers
No match
    From abcd  Sep 01 12:33:02 1997
No match

/^12.34/s
    12\n34
 0: 12\x0a34
    12\r34
 0: 12\x0d34

/\w+(?=\t)/
    the quick brown\t fox
 0: brown

/foo(?!bar)(.*)/
    foobar is foolish see?
 0: foolish see?
 1: foolish see
 2: foolish se
 3: foolish s
 4: foolish 
 5: foolish
 6: foolis
 7: fooli
 8: fool
 9: foo

/(?:(?!foo)...|^.{0,2})bar(.*)/
    foobar crowbar etc
 0: rowbar etc
 1: rowbar et
 2: rowbar e
 3: rowbar 
 4: rowbar
    barrel
 0: barrel
 1: barre
 2: barr
 3: bar
    2barrel
 0: 2barrel
 1: 2barre
 2: 2barr
 3: 2bar
    A barrel
 0: A barrel
 1: A barre
 2: A barr
 3: A bar

/^(\D*)(?=\d)(?!123)/
    abc456
 0: abc
    *** Failers
No match
    abc123
No match

/^1234(?# test newlines
  inside)/
    1234
 0: 1234

/^1234 #comment in extended re
  /x
    1234
 0: 1234

/#rhubarb
  abcd/x
    abcd
 0: abcd

/^abcd#rhubarb/x
    abcd
 0: abcd

/(?!^)abc/
    the abc
 0: abc
    *** Failers
No match
    abc
No match

/(?=^)abc/
    abc
 0: abc
    *** Failers
No match
    the abc
No match

/^[ab]{1,3}(ab*|b)/
    aabbbbb
 0: aabbbbb
 1: aabbbb
 2: aabbb
 3: aabb
 4: aab
 5: aa

/^[ab]{1,3}?(ab*|b)/
    aabbbbb
 0: aabbbbb
 1: aabbbb
 2: aabbb
 3: aabb
 4: aab
 5: aa

/^[ab]{1,3}?(ab*?|b)/
    aabbbbb
 0: aabbbbb
 1: aabbbb
 2: aabbb
 3: aabb
 4: aab
 5: aa

/^[ab]{1,3}(ab*?|b)/
    aabbbbb
 0: aabbbbb
 1: aabbbb
 2: aabbb
 3: aabb
 4: aab
 5: aa

/  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*                          # optional leading comment
(?:    (?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
" (?:                      # opening quote...
[^\\\x80-\xff\n\015"]                #   Anything except backslash and quote
|                     #    or
\\ [^\x80-\xff]           #   Escaped something (something != CR)
)* "  # closing quote
)                    # initial word
(?:  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*  \.  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*   (?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
" (?:                      # opening quote...
[^\\\x80-\xff\n\015"]                #   Anything except backslash and quote
|                     #    or
\\ [^\x80-\xff]           #   Escaped something (something != CR)
)* "  # closing quote
)  )* # further okay, if led by a period
(?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*  @  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*    (?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|   \[                         # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*    #    stuff
\]                        #           ]
)                           # initial subdomain
(?:                                  #
(?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*  \.                        # if led by a period...
(?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*   (?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|   \[                         # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*    #    stuff
\]                        #           ]
)                     #   ...further okay
)*
# address
|                     #  or
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
" (?:                      # opening quote...
[^\\\x80-\xff\n\015"]                #   Anything except backslash and quote
|                     #    or
\\ [^\x80-\xff]           #   Escaped something (something != CR)
)* "  # closing quote
)             # one word, optionally followed by....
(?:
[^()<>@,;:".\\\[\]\x80-\xff\000-\010\012-\037]  |  # atom and space parts, or...
\(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)       |  # comments, or...

" (?:                      # opening quote...
[^\\\x80-\xff\n\015"]                #   Anything except backslash and quote
|                     #    or
\\ [^\x80-\xff]           #   Escaped something (something != CR)
)* "  # closing quote
# quoted strings
)*
<  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*                     # leading <
(?:  @  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*    (?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|   \[                         # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*    #    stuff
\]                        #           ]
)                           # initial subdomain
(?:                                  #
(?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*  \.                        # if led by a period...
(?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*   (?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|   \[                         # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*    #    stuff
\]                        #           ]
)                     #   ...further okay
)*

(?:  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*  ,  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*  @  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*    (?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|   \[                         # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*    #    stuff
\]                        #           ]
)                           # initial subdomain
(?:                                  #
(?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*  \.                        # if led by a period...
(?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*   (?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|   \[                         # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*    #    stuff
\]                        #           ]
)                     #   ...further okay
)*
)* # further okay, if led by comma
:                                # closing colon
(?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*  )? #       optional route
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
" (?:                      # opening quote...
[^\\\x80-\xff\n\015"]                #   Anything except backslash and quote
|                     #    or
\\ [^\x80-\xff]           #   Escaped something (something != CR)
)* "  # closing quote
)                    # initial word
(?:  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*  \.  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*   (?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
" (?:                      # opening quote...
[^\\\x80-\xff\n\015"]                #   Anything except backslash and quote
|                     #    or
\\ [^\x80-\xff]           #   Escaped something (something != CR)
)* "  # closing quote
)  )* # further okay, if led by a period
(?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*  @  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*    (?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|   \[                         # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*    #    stuff
\]                        #           ]
)                           # initial subdomain
(?:                                  #
(?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*  \.                        # if led by a period...
(?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*   (?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|   \[                         # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*    #    stuff
\]                        #           ]
)                     #   ...further okay
)*
#       address spec
(?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*  > #                  trailing >
# name and address
)  (?: [\040\t] |  \(
(?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  |  \( (?:  [^\\\x80-\xff\n\015()]  |  \\ [^\x80-\xff]  )* \)  )*
\)  )*                       # optional trailing comment
/x
    Alan Other <user\@dom.ain>
 0: Alan Other <user@dom.ain>
    <user\@dom.ain>
 0: user@dom.ain
 1: user@dom
    user\@dom.ain
 0: user@dom.ain
 1: user@dom
    \"A. Other\" <user.1234\@dom.ain> (a comment)
 0: "A. Other" <user.1234@dom.ain> (a comment)
 1: "A. Other" <user.1234@dom.ain> 
 2: "A. Other" <user.1234@dom.ain>
    A. Other <user.1234\@dom.ain> (a comment)
 0:  Other <user.1234@dom.ain> (a comment)
 1:  Other <user.1234@dom.ain> 
 2:  Other <user.1234@dom.ain>
    \"/s=user/ou=host/o=place/prmd=uu.yy/admd= /c=gb/\"\@x400-re.lay
 0: "/s=user/ou=host/o=place/prmd=uu.yy/admd= /c=gb/"@x400-re.lay
 1: "/s=user/ou=host/o=place/prmd=uu.yy/admd= /c=gb/"@x400-re
    A missing angle <user\@some.where
 0: user@some.where
 1: user@some
    *** Failers
No match
    The quick brown fox
No match

/[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# optional leading comment
(?:
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
# Atom
|                       #  or
"                                     # "
[^\\\x80-\xff\n\015"] *                            #   normal
(?:  \\ [^\x80-\xff]  [^\\\x80-\xff\n\015"] * )*        #   ( special normal* )*
"                                     #        "
# Quoted string
)
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
(?:
\.
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
# Atom
|                       #  or
"                                     # "
[^\\\x80-\xff\n\015"] *                            #   normal
(?:  \\ [^\x80-\xff]  [^\\\x80-\xff\n\015"] * )*        #   ( special normal* )*
"                                     #        "
# Quoted string
)
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# additional words
)*
@
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
\[                            # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*     #    stuff
\]                           #           ]
)
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# optional trailing comments
(?:
\.
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
\[                            # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*     #    stuff
\]                           #           ]
)
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# optional trailing comments
)*
# address
|                             #  or
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
# Atom
|                       #  or
"                                     # "
[^\\\x80-\xff\n\015"] *                            #   normal
(?:  \\ [^\x80-\xff]  [^\\\x80-\xff\n\015"] * )*        #   ( special normal* )*
"                                     #        "
# Quoted string
)
# leading word
[^()<>@,;:".\\\[\]\x80-\xff\000-\010\012-\037] *               # "normal" atoms and or spaces
(?:
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
|
"                                     # "
[^\\\x80-\xff\n\015"] *                            #   normal
(?:  \\ [^\x80-\xff]  [^\\\x80-\xff\n\015"] * )*        #   ( special normal* )*
"                                     #        "
) # "special" comment or quoted string
[^()<>@,;:".\\\[\]\x80-\xff\000-\010\012-\037] *            #  more "normal"
)*
<
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# <
(?:
@
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
\[                            # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*     #    stuff
\]                           #           ]
)
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# optional trailing comments
(?:
\.
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
\[                            # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*     #    stuff
\]                           #           ]
)
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# optional trailing comments
)*
(?: ,
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
@
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
\[                            # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*     #    stuff
\]                           #           ]
)
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# optional trailing comments
(?:
\.
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
\[                            # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*     #    stuff
\]                           #           ]
)
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# optional trailing comments
)*
)*  # additional domains
:
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# optional trailing comments
)?     #       optional route
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
# Atom
|                       #  or
"                                     # "
[^\\\x80-\xff\n\015"] *                            #   normal
(?:  \\ [^\x80-\xff]  [^\\\x80-\xff\n\015"] * )*        #   ( special normal* )*
"                                     #        "
# Quoted string
)
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
(?:
\.
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
# Atom
|                       #  or
"                                     # "
[^\\\x80-\xff\n\015"] *                            #   normal
(?:  \\ [^\x80-\xff]  [^\\\x80-\xff\n\015"] * )*        #   ( special normal* )*
"                                     #        "
# Quoted string
)
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# additional words
)*
@
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
\[                            # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*     #    stuff
\]                           #           ]
)
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# optional trailing comments
(?:
\.
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
(?:
[^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]+    # some number of atom characters...
(?![^(\040)<>@,;:".\\\[\]\000-\037\x80-\xff]) # ..not followed by something that could be part of an atom
|
\[                            # [
(?: [^\\\x80-\xff\n\015\[\]] |  \\ [^\x80-\xff]  )*     #    stuff
\]                           #           ]
)
[\040\t]*                    # Nab whitespace.
(?:
\(                              #  (
[^\\\x80-\xff\n\015()] *                             #     normal*
(?:                                 #       (
(?:  \\ [^\x80-\xff]  |
\(                            #  (
[^\\\x80-\xff\n\015()] *                            #     normal*
(?:  \\ [^\x80-\xff]   [^\\\x80-\xff\n\015()] * )*        #     (special normal*)*
\)                           #                       )
)    #         special
[^\\\x80-\xff\n\015()] *                         #         normal*
)*                                  #            )*
\)                             #                )
[\040\t]* )*    # If comment found, allow more spaces.
# optional trailing comments
)*
#       address spec
>                    #                 >
# name and address
)
/x
    Alan Other <user\@dom.ain>
 0: Alan Other <user@dom.ain>
    <user\@dom.ain>
 0: user@dom.ain
 1: user@dom
    user\@dom.ain
 0: user@dom.ain
 1: user@dom
    \"A. Other\" <user.1234\@dom.ain> (a comment)
 0: "A. Other" <user.1234@dom.ain>
    A. Other <user.1234\@dom.ain> (a comment)
 0:  Other <user.1234@dom.ain>
    \"/s=user/ou=host/o=place/prmd=uu.yy/admd= /c=gb/\"\@x400-re.lay
 0: "/s=user/ou=host/o=place/prmd=uu.yy/admd= /c=gb/"@x400-re.lay
 1: "/s=user/ou=host/o=place/prmd=uu.yy/admd= /c=gb/"@x400-re
    A missing angle <user\@some.where
 0: user@some.where
 1: user@some
    *** Failers
No match
    The quick brown fox
No match

/abc\0def\00pqr\000xyz\0000AB/
    abc\0def\00pqr\000xyz\0000AB
 0: abc\x00def\x00pqr\x00xyz\x000AB
    abc456 abc\0def\00pqr\000xyz\0000ABCDE
 0: abc\x00def\x00pqr\x00xyz\x000AB

/abc\x0def\x00pqr\x000xyz\x0000AB/
    abc\x0def\x00pqr\x000xyz\x0000AB
 0: abc\x0def\x00pqr\x000xyz\x0000AB
    abc456 abc\x0def\x00pqr\x000xyz\x0000ABCDE
 0: abc\x0def\x00pqr\x000xyz\x0000AB

/^[\000-\037]/
    \0A
 0: \x00
    \01B
 0: \x01
    \037C
 0: \x1f

/\0*/
    \0\0\0\0
 0: \x00\x00\x00\x00
 1: \x00\x00\x00
 2: \x00\x00
 3: \x00
 4: 

/A\x0{2,3}Z/
    The A\x0\x0Z
 0: A\x00\x00Z
    An A\0\x0\0Z
 0: A\x00\x00\x00Z
    *** Failers
No match
    A\0Z
No match
    A\0\x0\0\x0Z
No match

/^\s/
    \040abc
 0:  
    \x0cabc
 0: \x0c
    \nabc
 0: \x0a
    \rabc
 0: \x0d
    \tabc
 0: \x09
    *** Failers
No match
    abc
No match

/^a	b
      c/x
    abc
 0: abc

/ab{1,3}bc/
    abbbbc
 0: abbbbc
    abbbc
 0: abbbc
    abbc
 0: abbc
    *** Failers
No match
    abc
No match
    abbbbbc
No match

/([^.]*)\.([^:]*):[T ]+(.*)/
    track1.title:TBlah blah blah
 0: track1.title:TBlah blah blah
 1: track1.title:TBlah blah bla
 2: track1.title:TBlah blah bl
 3: track1.title:TBlah blah b
 4: track1.title:TBlah blah 
 5: track1.title:TBlah blah
 6: track1.title:TBlah bla
 7: track1.title:TBlah bl
 8: track1.title:TBlah b
 9: track1.title:TBlah 
10: track1.title:TBlah
11: track1.title:TBla
12: track1.title:TBl
13: track1.title:TB
14: track1.title:T

/([^.]*)\.([^:]*):[T ]+(.*)/i
    track1.title:TBlah blah blah
 0: track1.title:TBlah blah blah
 1: track1.title:TBlah blah bla
 2: track1.title:TBlah blah bl
 3: track1.title:TBlah blah b
 4: track1.title:TBlah blah 
 5: track1.title:TBlah blah
 6: track1.title:TBlah bla
 7: track1.title:TBlah bl
 8: track1.title:TBlah b
 9: track1.title:TBlah 
10: track1.title:TBlah
11: track1.title:TBla
12: track1.title:TBl
13: track1.title:TB
14: track1.title:T

/([^.]*)\.([^:]*):[t ]+(.*)/i
    track1.title:TBlah blah blah
 0: track1.title:TBlah blah blah
 1: track1.title:TBlah blah bla
 2: track1.title:TBlah blah bl
 3: track1.title:TBlah blah b
 4: track1.title:TBlah blah 
 5: track1.title:TBlah blah
 6: track1.title:TBlah bla
 7: track1.title:TBlah bl
 8: track1.title:TBlah b
 9: track1.title:TBlah 
10: track1.title:TBlah
11: track1.title:TBla
12: track1.title:TBl
13: track1.title:TB
14: track1.title:T

/^[W-c]+$/
    WXY_^abc
 0: WXY_^abc
    *** Failers
No match
    wxy
No match

/^[W-c]+$/i
    WXY_^abc
 0: WXY_^abc
    wxy_^ABC
 0: wxy_^ABC

/^[\x3f-\x5F]+$/i
    WXY_^abc
 0: WXY_^abc
    wxy_^ABC
 0: wxy_^ABC

/^abc$/m
    abc
 0: abc
    qqq\nabc
 0: abc
    abc\nzzz
 0: abc
    qqq\nabc\nzzz
 0: abc

/^abc$/
    abc
 0: abc
    *** Failers
No match
    qqq\nabc
No match
    abc\nzzz
No match
    qqq\nabc\nzzz
No match

/\Aabc\Z/m
    abc
 0: abc
    abc\n 
 0: abc
    *** Failers
No match
    qqq\nabc
No match
    abc\nzzz
No match
    qqq\nabc\nzzz
No match
    
/\A(.)*\Z/s
    abc\ndef
 0: abc\x0adef

/\A(.)*\Z/m
    *** Failers
 0: *** Failers
    abc\ndef
No match

/(?:b)|(?::+)/
    b::c
 0: b
    c::b
 0: ::
 1: :

/[-az]+/
    az-
 0: az-
 1: az
 2: a
    *** Failers
 0: a
    b
No match

/[az-]+/
    za-
 0: za-
 1: za
 2: z
    *** Failers
 0: a
    b
No match

/[a\-z]+/
    a-z
 0: a-z
 1: a-
 2: a
    *** Failers
 0: a
    b
No match

/[a-z]+/
    abcdxyz
 0: abcdxyz
 1: abcdxy
 2: abcdx
 3: abcd
 4: abc
 5: ab
 6: a

/[\d-]+/
    12-34
 0: 12-34
 1: 12-3
 2: 12-
 3: 12
 4: 1
    *** Failers
No match
    aaa
No match

/[\d-z]+/
    12-34z
 0: 12-34z
 1: 12-34
 2: 12-3
 3: 12-
 4: 12
 5: 1
    *** Failers
No match
    aaa
No match

/\x5c/
    \\
 0: \

/\x20Z/
    the Zoo
 0:  Z
    *** Failers
No match
    Zulu
No match

/ab{3cd/
    ab{3cd
 0: ab{3cd

/ab{3,cd/
    ab{3,cd
 0: ab{3,cd

/ab{3,4a}cd/
    ab{3,4a}cd
 0: ab{3,4a}cd

/{4,5a}bc/
    {4,5a}bc
 0: {4,5a}bc

/^a.b/<lf>
    a\rb
 0: a\x0db
    *** Failers
No match
    a\nb
No match

/abc$/
    abc
 0: abc
    abc\n
 0: abc
    *** Failers
No match
    abc\ndef
No match

/(abc)\123/
    abc\x53
 0: abcS

/(abc)\223/
    abc\x93
 0: abc\x93

/(abc)\323/
    abc\xd3
 0: abc\xd3

/(abc)\100/
    abc\x40
 0: abc@
    abc\100
 0: abc@

/(abc)\1000/
    abc\x400
 0: abc@0
    abc\x40\x30
 0: abc@0
    abc\1000
 0: abc@0
    abc\100\x30
 0: abc@0
    abc\100\060
 0: abc@0
    abc\100\60
 0: abc@0

/abc\81/
    abc\081
 0: abc\x0081
    abc\0\x38\x31
 0: abc\x0081

/abc\91/
    abc\091
 0: abc\x0091
    abc\0\x39\x31
 0: abc\x0091

/(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)\12\123/
    abcdefghijk\12S
 0: abcdefghijk\x0aS

/ab\idef/
    abidef
 0: abidef

/a{0}bc/
    bc
 0: bc

/(a|(bc)){0,0}?xyz/
    xyz
 0: xyz

/abc[\10]de/
    abc\010de
 0: abc\x08de

/abc[\1]de/
    abc\1de
 0: abc\x01de

/(abc)[\1]de/
    abc\1de
 0: abc\x01de

/(?s)a.b/
    a\nb
 0: a\x0ab

/^([^a])([^\b])([^c]*)([^d]{3,4})/
    baNOTccccd
 0: baNOTcccc
 1: baNOTccc
 2: baNOTcc
 3: baNOTc
 4: baNOT
    baNOTcccd
 0: baNOTccc
 1: baNOTcc
 2: baNOTc
 3: baNOT
    baNOTccd
 0: baNOTcc
 1: baNOTc
 2: baNOT
    bacccd
 0: baccc
    *** Failers
 0: *** Failers
 1: *** Failer
 2: *** Faile
 3: *** Fail
 4: *** Fai
 5: *** Fa
 6: *** F
    anything
No match
    b\bc   
No match
    baccd
No match

/[^a]/
    Abc
 0: A
  
/[^a]/i
    Abc 
 0: b

/[^a]+/
    AAAaAbc
 0: AAA
 1: AA
 2: A
  
/[^a]+/i
    AAAaAbc 
 0: bc
 1: b

/[^a]+/
    bbb\nccc
 0: bbb\x0accc
 1: bbb\x0acc
 2: bbb\x0ac
 3: bbb\x0a
 4: bbb
 5: bb
 6: b
   
/[^k]$/
    abc
 0: c
    *** Failers
 0: s
    abk   
No match
   
/[^k]{2,3}$/
    abc
 0: abc
    kbc
 0: bc
    kabc 
 0: abc
    *** Failers
 0: ers
    abk
No match
    akb
No match
    akk 
No match

/^\d{8,}\@.+[^k]$/
    12345678\@a.b.c.d
 0: 12345678@a.b.c.d
    123456789\@x.y.z
 0: 123456789@x.y.z
    *** Failers
No match
    12345678\@x.y.uk
No match
    1234567\@a.b.c.d       
No match

/[^a]/
    aaaabcd
 0: b
    aaAabcd 
 0: A

/[^a]/i
    aaaabcd
 0: b
    aaAabcd 
 0: b

/[^az]/
    aaaabcd
 0: b
    aaAabcd 
 0: A

/[^az]/i
    aaaabcd
 0: b
    aaAabcd 
 0: b

/\000\001\002\003\004\005\006\007\010\011\012\013\014\015\016\017\020\021\022\023\024\025\026\027\030\031\032\033\034\035\036\037\040\041\042\043\044\045\046\047\050\051\052\053\054\055\056\057\060\061\062\063\064\065\066\067\070\071\072\073\074\075\076\077\100\101\102\103\104\105\106\107\110\111\112\113\114\115\116\117\120\121\122\123\124\125\126\127\130\131\132\133\134\135\136\137\140\141\142\143\144\145\146\147\150\151\152\153\154\155\156\157\160\161\162\163\164\165\166\167\170\171\172\173\174\175\176\177\200\201\202\203\204\205\206\207\210\211\212\213\214\215\216\217\220\221\222\223\224\225\226\227\230\231\232\233\234\235\236\237\240\241\242\243\244\245\246\247\250\251\252\253\254\255\256\257\260\261\262\263\264\265\266\267\270\271\272\273\274\275\276\277\300\301\302\303\304\305\306\307\310\311\312\313\314\315\316\317\320\321\322\323\324\325\326\327\330\331\332\333\334\335\336\337\340\341\342\343\344\345\346\347\350\351\352\353\354\355\356\357\360\361\362\363\364\365\366\367\370\371\372\373\374\375\376\377/
 \000\001\002\003\004\005\006\007\010\011\012\013\014\015\016\017\020\021\022\023\024\025\026\027\030\031\032\033\034\035\036\037\040\041\042\043\044\045\046\047\050\051\052\053\054\055\056\057\060\061\062\063\064\065\066\067\070\071\072\073\074\075\076\077\100\101\102\103\104\105\106\107\110\111\112\113\114\115\116\117\120\121\122\123\124\125\126\127\130\131\132\133\134\135\136\137\140\141\142\143\144\145\146\147\150\151\152\153\154\155\156\157\160\161\162\163\164\165\166\167\170\171\172\173\174\175\176\177\200\201\202\203\204\205\206\207\210\211\212\213\214\215\216\217\220\221\222\223\224\225\226\227\230\231\232\233\234\235\236\237\240\241\242\243\244\245\246\247\250\251\252\253\254\255\256\257\260\261\262\263\264\265\266\267\270\271\272\273\274\275\276\277\300\301\302\303\304\305\306\307\310\311\312\313\314\315\316\317\320\321\322\323\324\325\326\327\330\331\332\333\334\335\336\337\340\341\342\343\344\345\346\347\350\351\352\353\354\355\356\357\360\361\362\363\364\365\366\367\370\371\372\373\374\375\376\377
 0: \x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff

/P[^*]TAIRE[^*]{1,6}?LL/
    xxxxxxxxxxxPSTAIREISLLxxxxxxxxx
 0: PSTAIREISLL

/P[^*]TAIRE[^*]{1,}?LL/
    xxxxxxxxxxxPSTAIREISLLxxxxxxxxx
 0: PSTAIREISLL

/(\.\d\d[1-9]?)\d+/
    1.230003938
 0: .230003938
 1: .23000393
 2: .2300039
 3: .230003
 4: .23000
 5: .2300
 6: .230
    1.875000282   
 0: .875000282
 1: .87500028
 2: .8750002
 3: .875000
 4: .87500
 5: .8750
 6: .875
    1.235  
 0: .235
                  
/(\.\d\d((?=0)|\d(?=\d)))/
    1.230003938      
 0: .230
 1: .23
    1.875000282
 0: .875
    *** Failers 
No match
    1.235 
No match
    
/a(?)b/
    ab 
 0: ab
 
/\b(foo)\s+(\w+)/i
    Food is on the foo table
 0: foo table
 1: foo tabl
 2: foo tab
 3: foo ta
 4: foo t
    
/foo(.*)bar/
    The food is under the bar in the barn.
 0: food is under the bar in the bar
 1: food is under the bar
    
/foo(.*?)bar/  
    The food is under the bar in the barn.
 0: food is under the bar in the bar
 1: food is under the bar

/(.*)(\d*)/
    I have 2 numbers: 53147
Matched, but too many subsidiary matches
 0: I have 2 numbers: 53147
 1: I have 2 numbers: 5314
 2: I have 2 numbers: 531
 3: I have 2 numbers: 53
 4: I have 2 numbers: 5
 5: I have 2 numbers: 
 6: I have 2 numbers:
 7: I have 2 numbers
 8: I have 2 number
 9: I have 2 numbe
10: I have 2 numb
11: I have 2 num
12: I have 2 nu
13: I have 2 n
14: I have 2 
15: I have 2
16: I have 
17: I have
18: I hav
19: I ha
20: I h
21: I 
    
/(.*)(\d+)/
    I have 2 numbers: 53147
 0: I have 2 numbers: 53147
 1: I have 2 numbers: 5314
 2: I have 2 numbers: 531
 3: I have 2 numbers: 53
 4: I have 2 numbers: 5
 5: I have 2
 
/(.*?)(\d*)/
    I have 2 numbers: 53147
Matched, but too many subsidiary matches
 0: I have 2 numbers: 53147
 1: I have 2 numbers: 5314
 2: I have 2 numbers: 531
 3: I have 2 numbers: 53
 4: I have 2 numbers: 5
 5: I have 2 numbers: 
 6: I have 2 numbers:
 7: I have 2 numbers
 8: I have 2 number
 9: I have 2 numbe
10: I have 2 numb
11: I have 2 num
12: I have 2 nu
13: I have 2 n
14: I have 2 
15: I have 2
16: I have 
17: I have
18: I hav
19: I ha
20: I h
21: I 

/(.*?)(\d+)/
    I have 2 numbers: 53147
 0: I have 2 numbers: 53147
 1: I have 2 numbers: 5314
 2: I have 2 numbers: 531
 3: I have 2 numbers: 53
 4: I have 2 numbers: 5
 5: I have 2

/(.*)(\d+)$/
    I have 2 numbers: 53147
 0: I have 2 numbers: 53147

/(.*?)(\d+)$/
    I have 2 numbers: 53147
 0: I have 2 numbers: 53147

/(.*)\b(\d+)$/
    I have 2 numbers: 53147
 0: I have 2 numbers: 53147

/(.*\D)(\d+)$/
    I have 2 numbers: 53147
 0: I have 2 numbers: 53147

/^\D*(?!123)/
    ABC123
 0: AB
 1: A
 2: 
     
/^(\D*)(?=\d)(?!123)/
    ABC445
 0: ABC
    *** Failers
No match
    ABC123
No match
    
/^[W-]46]/
    W46]789 
 0: W46]
    -46]789
 0: -46]
    *** Failers
No match
    Wall
No match
    Zebra
No match
    42
No match
    [abcd] 
No match
    ]abcd[
No match
       
/^[W-\]46]/
    W46]789 
 0: W
    Wall
 0: W
    Zebra
 0: Z
    Xylophone  
 0: X
    42
 0: 4
    [abcd] 
 0: [
    ]abcd[
 0: ]
    \\backslash 
 0: \
    *** Failers
No match
    -46]789
No match
    well
No match
    
/\d\d\/\d\d\/\d\d\d\d/
    01/01/2000
 0: 01/01/2000

/word (?:[a-zA-Z0-9]+ ){0,10}otherword/
  word cat dog elephant mussel cow horse canary baboon snake shark otherword
 0: word cat dog elephant mussel cow horse canary baboon snake shark otherword
  word cat dog elephant mussel cow horse canary baboon snake shark
No match

/word (?:[a-zA-Z0-9]+ ){0,300}otherword/
  word cat dog elephant mussel cow horse canary baboon snake shark the quick brown fox and the lazy dog and several other words getting close to thirty by now I hope
No match

/^(a){0,0}/
    bcd
 0: 
    abc
 0: 
    aab     
 0: 

/^(a){0,1}/
    bcd
 0: 
    abc
 0: a
 1: 
    aab  
 0: a
 1: 

/^(a){0,2}/
    bcd
 0: 
    abc
 0: a
 1: 
    aab  
 0: aa
 1: a
 2: 

/^(a){0,3}/
    bcd
 0: 
    abc
 0: a
 1: 
    aab
 0: aa
 1: a
 2: 
    aaa   
 0: aaa
 1: aa
 2: a
 3: 

/^(a){0,}/
    bcd
 0: 
    abc
 0: a
 1: 
    aab
 0: aa
 1: a
 2: 
    aaa
 0: aaa
 1: aa
 2: a
 3: 
    aaaaaaaa    
 0: aaaaaaaa
 1: aaaaaaa
 2: aaaaaa
 3: aaaaa
 4: aaaa
 5: aaa
 6: aa
 7: a
 8: 

/^(a){1,1}/
    bcd
No match
    abc
 0: a
    aab  
 0: a

/^(a){1,2}/
    bcd
No match
    abc
 0: a
    aab  
 0: aa
 1: a

/^(a){1,3}/
    bcd
No match
    abc
 0: a
    aab
 0: aa
 1: a
    aaa   
 0: aaa
 1: aa
 2: a

/^(a){1,}/
    bcd
No match
    abc
 0: a
    aab
 0: aa
 1: a
    aaa
 0: aaa
 1: aa
 2: a
    aaaaaaaa    
 0: aaaaaaaa
 1: aaaaaaa
 2: aaaaaa
 3: aaaaa
 4: aaaa
 5: aaa
 6: aa
 7: a

/.*\.gif/
    borfle\nbib.gif\nno
 0: bib.gif

/.{0,}\.gif/
    borfle\nbib.gif\nno
 0: bib.gif

/.*\.gif/m
    borfle\nbib.gif\nno
 0: bib.gif

/.*\.gif/s
    borfle\nbib.gif\nno
 0: borfle\x0abib.gif

/.*\.gif/ms
    borfle\nbib.gif\nno
 0: borfle\x0abib.gif
    
/.*$/
    borfle\nbib.gif\nno
 0: no

/.*$/m
    borfle\nbib.gif\nno
 0: borfle

/.*$/s
    borfle\nbib.gif\nno
 0: borfle\x0abib.gif\x0ano

/.*$/ms
    borfle\nbib.gif\nno
 0: borfle\x0abib.gif\x0ano
 1: borfle\x0abib.gif
 2: borfle
    
/.*$/
    borfle\nbib.gif\nno\n
 0: no

/.*$/m
    borfle\nbib.gif\nno\n
 0: borfle

/.*$/s
    borfle\nbib.gif\nno\n
 0: borfle\x0abib.gif\x0ano\x0a
 1: borfle\x0abib.gif\x0ano

/.*$/ms
    borfle\nbib.gif\nno\n
 0: borfle\x0abib.gif\x0ano\x0a
 1: borfle\x0abib.gif\x0ano
 2: borfle\x0abib.gif
 3: borfle
    
/(.*X|^B)/
    abcde\n1234Xyz
 0: 1234X
    BarFoo 
 0: B
    *** Failers
No match
    abcde\nBar  
No match

/(.*X|^B)/m
    abcde\n1234Xyz
 0: 1234X
    BarFoo 
 0: B
    abcde\nBar  
 0: B

/(.*X|^B)/s
    abcde\n1234Xyz
 0: abcde\x0a1234X
    BarFoo 
 0: B
    *** Failers
No match
    abcde\nBar  
No match

/(.*X|^B)/ms
    abcde\n1234Xyz
 0: abcde\x0a1234X
    BarFoo 
 0: B
    abcde\nBar  
 0: B

/(?s)(.*X|^B)/
    abcde\n1234Xyz
 0: abcde\x0a1234X
    BarFoo 
 0: B
    *** Failers 
No match
    abcde\nBar  
No match

/(?s:.*X|^B)/
    abcde\n1234Xyz
 0: abcde\x0a1234X
    BarFoo 
 0: B
    *** Failers 
No match
    abcde\nBar  
No match

/^.*B/
    **** Failers
No match
    abc\nB
No match
     
/(?s)^.*B/
    abc\nB
 0: abc\x0aB

/(?m)^.*B/
    abc\nB
 0: B
     
/(?ms)^.*B/
    abc\nB
 0: abc\x0aB

/(?ms)^B/
    abc\nB
 0: B

/(?s)B$/
    B\n
 0: B

/^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]/
    123456654321
 0: 123456654321
  
/^\d\d\d\d\d\d\d\d\d\d\d\d/
    123456654321 
 0: 123456654321

/^[\d][\d][\d][\d][\d][\d][\d][\d][\d][\d][\d][\d]/
    123456654321
 0: 123456654321
  
/^[abc]{12}/
    abcabcabcabc
 0: abcabcabcabc
    
/^[a-c]{12}/
    abcabcabcabc
 0: abcabcabcabc
    
/^(a|b|c){12}/
    abcabcabcabc 
 0: abcabcabcabc

/^[abcdefghijklmnopqrstuvwxy0123456789]/
    n
 0: n
    *** Failers 
No match
    z 
No match

/abcde{0,0}/
    abcd
 0: abcd
    *** Failers
No match
    abce  
No match

/ab[cd]{0,0}e/
    abe
 0: abe
    *** Failers
No match
    abcde 
No match
    
/ab(c){0,0}d/
    abd
 0: abd
    *** Failers
No match
    abcd   
No match

/a(b*)/
    a
 0: a
    ab
 0: ab
 1: a
    abbbb
 0: abbbb
 1: abbb
 2: abb
 3: ab
 4: a
    *** Failers
 0: a
    bbbbb    
No match
    
/ab\d{0}e/
    abe
 0: abe
    *** Failers
No match
    ab1e   
No match
    
/"([^\\"]+|\\.)*"/
    the \"quick\" brown fox
 0: "quick"
    \"the \\\"quick\\\" brown fox\" 
 0: "the \"quick\" brown fox"

/.*?/g+
    abc
 0: abc
 0+ 
 1: ab
 2: a
 3: 
 0: 
 0+ 
  
/\b/g+
    abc 
 0: 
 0+ abc
 0: 
 0+ 

/\b/+g
    abc 
 0: 
 0+ abc
 0: 
 0+ 

//g
    abc
 0: 
 0: 
 0: 
 0: 

/<tr([\w\W\s\d][^<>]{0,})><TD([\w\W\s\d][^<>]{0,})>([\d]{0,}\.)(.*)((<BR>([\w\W\s\d][^<>]{0,})|[\s]{0,}))<\/a><\/TD><TD([\w\W\s\d][^<>]{0,})>([\w\W\s\d][^<>]{0,})<\/TD><TD([\w\W\s\d][^<>]{0,})>([\w\W\s\d][^<>]{0,})<\/TD><\/TR>/is
  <TR BGCOLOR='#DBE9E9'><TD align=left valign=top>43.<a href='joblist.cfm?JobID=94 6735&Keyword='>Word Processor<BR>(N-1286)</a></TD><TD align=left valign=top>Lega lstaff.com</TD><TD align=left valign=top>CA - Statewide</TD></TR>
 0: <TR BGCOLOR='#DBE9E9'><TD align=left valign=top>43.<a href='joblist.cfm?JobID=94 6735&Keyword='>Word Processor<BR>(N-1286)</a></TD><TD align=left valign=top>Lega lstaff.com</TD><TD align=left valign=top>CA - Statewide</TD></TR>

/a[^a]b/
    acb
 0: acb
    a\nb
 0: a\x0ab
    
/a.b/
    acb
 0: acb
    *** Failers 
No match
    a\nb   
No match
    
/a[^a]b/s
    acb
 0: acb
    a\nb  
 0: a\x0ab
    
/a.b/s
    acb
 0: acb
    a\nb  
 0: a\x0ab

/^(b+?|a){1,2}?c/
    bac
 0: bac
    bbac
 0: bbac
    bbbac
 0: bbbac
    bbbbac
 0: bbbbac
    bbbbbac 
 0: bbbbbac

/^(b+|a){1,2}?c/
    bac
 0: bac
    bbac
 0: bbac
    bbbac
 0: bbbac
    bbbbac
 0: bbbbac
    bbbbbac 
 0: bbbbbac
    
/(?!\A)x/m
    x\nb\n
No match
    a\bx\n  
 0: x
    
/\x0{ab}/
    \0{ab} 
 0: \x00{ab}

/(A|B)*?CD/
    CD 
 0: CD
    
/(A|B)*CD/
    CD 
 0: CD

/(?<!bar)foo/
    foo
 0: foo
    catfood
 0: foo
    arfootle
 0: foo
    rfoosh
 0: foo
    *** Failers
No match
    barfoo
No match
    towbarfoo
No match

/\w{3}(?<!bar)foo/
    catfood
 0: catfoo
    *** Failers
No match
    foo
No match
    barfoo
No match
    towbarfoo
No match

/(?<=(foo)a)bar/
    fooabar
 0: bar
    *** Failers
No match
    bar
No match
    foobbar
No match
      
/\Aabc\z/m
    abc
 0: abc
    *** Failers
No match
    abc\n   
No match
    qqq\nabc
No match
    abc\nzzz
No match
    qqq\nabc\nzzz
No match

"(?>.*/)foo"
    /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/it/you/see/
No match

"(?>.*/)foo"
    /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/and/foo
 0: /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/and/foo

/(?>(\.\d\d[1-9]?))\d+/
    1.230003938
 0: .230003938
 1: .23000393
 2: .2300039
 3: .230003
 4: .23000
 5: .2300
 6: .230
    1.875000282
 0: .875000282
 1: .87500028
 2: .8750002
 3: .875000
 4: .87500
 5: .8750
    *** Failers 
No match
    1.235 
No match

/^((?>\w+)|(?>\s+))*$/
    now is the time for all good men to come to the aid of the party
 0: now is the time for all good men to come to the aid of the party
    *** Failers
No match
    this is not a line with only words and spaces!
No match
    
/(\d+)(\w)/
    12345a
 0: 12345a
 1: 12345
 2: 1234
 3: 123
 4: 12
    12345+ 
 0: 12345
 1: 1234
 2: 123
 3: 12

/((?>\d+))(\w)/
    12345a
 0: 12345a
    *** Failers
No match
    12345+ 
No match

/(?>a+)b/
    aaab
 0: aaab

/((?>a+)b)/
    aaab
 0: aaab

/(?>(a+))b/
    aaab
 0: aaab

/(?>b)+/
    aaabbbccc
 0: bbb
 1: bb
 2: b

/(?>a+|b+|c+)*c/
    aaabbbbccccd
 0: aaabbbbcccc
 1: aaabbbbc
    
/(a+|b+|c+)*c/
    aaabbbbccccd
 0: aaabbbbcccc
 1: aaabbbbccc
 2: aaabbbbcc
 3: aaabbbbc

/((?>[^()]+)|\([^()]*\))+/
    ((abc(ade)ufh()()x
 0: abc(ade)ufh()()x
 1: abc(ade)ufh()()
 2: abc(ade)ufh()
 3: abc(ade)ufh
 4: abc(ade)
 5: abc
    
/\(((?>[^()]+)|\([^()]+\))+\)/ 
    (abc)
 0: (abc)
    (abc(def)xyz)
 0: (abc(def)xyz)
    *** Failers
No match
    ((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa   
No match

/a(?-i)b/i
    ab
 0: ab
    Ab
 0: Ab
    *** Failers 
No match
    aB
No match
    AB
No match
        
/(a (?x)b c)d e/
    a bcd e
 0: a bcd e
    *** Failers
No match
    a b cd e
No match
    abcd e   
No match
    a bcde 
No match
 
/(a b(?x)c d (?-x)e f)/
    a bcde f
 0: a bcde f
    *** Failers
No match
    abcdef  
No match

/(a(?i)b)c/
    abc
 0: abc
    aBc
 0: aBc
    *** Failers
No match
    abC
No match
    aBC  
No match
    Abc
No match
    ABc
No match
    ABC
No match
    AbC
No match
    
/a(?i:b)c/
    abc
 0: abc
    aBc
 0: aBc
    *** Failers 
No match
    ABC
No match
    abC
No match
    aBC
No match
    
/a(?i:b)*c/
    aBc
 0: aBc
    aBBc
 0: aBBc
    *** Failers 
No match
    aBC
No match
    aBBC
No match
    
/a(?=b(?i)c)\w\wd/
    abcd
 0: abcd
    abCd
 0: abCd
    *** Failers
No match
    aBCd
No match
    abcD     
No match
    
/(?s-i:more.*than).*million/i
    more than million
 0: more than million
    more than MILLION
 0: more than MILLION
    more \n than Million 
 0: more \x0a than Million
    *** Failers
No match
    MORE THAN MILLION    
No match
    more \n than \n million 
No match

/(?:(?s-i)more.*than).*million/i
    more than million
 0: more than million
    more than MILLION
 0: more than MILLION
    more \n than Million 
 0: more \x0a than Million
    *** Failers
No match
    MORE THAN MILLION    
No match
    more \n than \n million 
No match
    
/(?>a(?i)b+)+c/ 
    abc
 0: abc
    aBbc
 0: aBbc
    aBBc 
 0: aBBc
    *** Failers
No match
    Abc
No match
    abAb    
No match
    abbC 
No match
    
/(?=a(?i)b)\w\wc/
    abc
 0: abc
    aBc
 0: aBc
    *** Failers
No match
    Ab 
No match
    abC
No match
    aBC     
No match
    
/(?<=a(?i)b)(\w\w)c/
    abxxc
 0: xxc
    aBxxc
 0: xxc
    *** Failers
No match
    Abxxc
No match
    ABxxc
No match
    abxxC      
No match

/^(?(?=abc)\w{3}:|\d\d)$/
    abc:
 0: abc:
    12
 0: 12
    *** Failers
No match
    123
No match
    xyz    
No match

/^(?(?!abc)\d\d|\w{3}:)$/
    abc:
 0: abc:
    12
 0: 12
    *** Failers
No match
    123
No match
    xyz    
No match
    
/(?(?<=foo)bar|cat)/
    foobar
 0: bar
    cat
 0: cat
    fcat
 0: cat
    focat   
 0: cat
    *** Failers
No match
    foocat  
No match

/(?(?<!foo)cat|bar)/
    foobar
 0: bar
    cat
 0: cat
    fcat
 0: cat
    focat   
 0: cat
    *** Failers
No match
    foocat  
No match

/(?>a*)*/
    a
 0: a
 1: 
    aa
 0: aa
 1: 
    aaaa
 0: aaaa
 1: 
    
/(abc|)+/
    abc
 0: abc
 1: 
    abcabc
 0: abcabc
 1: abc
 2: 
    abcabcabc
 0: abcabcabc
 1: abcabc
 2: abc
 3: 
    xyz      
 0: 

/([a]*)*/
    a
 0: a
 1: 
    aaaaa 
 0: aaaaa
 1: aaaa
 2: aaa
 3: aa
 4: a
 5: 
 
/([ab]*)*/
    a
 0: a
 1: 
    b
 0: b
 1: 
    ababab
 0: ababab
 1: ababa
 2: abab
 3: aba
 4: ab
 5: a
 6: 
    aaaabcde
 0: aaaab
 1: aaaa
 2: aaa
 3: aa
 4: a
 5: 
    bbbb    
 0: bbbb
 1: bbb
 2: bb
 3: b
 4: 
 
/([^a]*)*/
    b
 0: b
 1: 
    bbbb
 0: bbbb
 1: bbb
 2: bb
 3: b
 4: 
    aaa   
 0: 
 
/([^ab]*)*/
    cccc
 0: cccc
 1: ccc
 2: cc
 3: c
 4: 
    abab  
 0: 
 
/([a]*?)*/
    a
 0: a
 1: 
    aaaa 
 0: aaaa
 1: aaa
 2: aa
 3: a
 4: 
 
/([ab]*?)*/
    a
 0: a
 1: 
    b
 0: b
 1: 
    abab
 0: abab
 1: aba
 2: ab
 3: a
 4: 
    baba   
 0: baba
 1: bab
 2: ba
 3: b
 4: 
 
/([^a]*?)*/
    b
 0: b
 1: 
    bbbb
 0: bbbb
 1: bbb
 2: bb
 3: b
 4: 
    aaa   
 0: 
 
/([^ab]*?)*/
    c
 0: c
 1: 
    cccc
 0: cccc
 1: ccc
 2: cc
 3: c
 4: 
    baba   
 0: 
 
/(?>a*)*/
    a
 0: a
 1: 
    aaabcde 
 0: aaa
 1: 
 
/((?>a*))*/
    aaaaa
 0: aaaaa
 1: 
    aabbaa 
 0: aa
 1: 
 
/((?>a*?))*/
    aaaaa
 0: aaaaa
 1: 
    aabbaa 
 0: aa
 1: 

/(?(?=[^a-z]+[a-z])  \d{2}-[a-z]{3}-\d{2}  |  \d{2}-\d{2}-\d{2} ) /x
    12-sep-98
 0: 12-sep-98
    12-09-98
 0: 12-09-98
    *** Failers
No match
    sep-12-98
No match
        
/(?i:saturday|sunday)/
    saturday
 0: saturday
    sunday
 0: sunday
    Saturday
 0: Saturday
    Sunday
 0: Sunday
    SATURDAY
 0: SATURDAY
    SUNDAY
 0: SUNDAY
    SunDay
 0: SunDay
    
/(a(?i)bc|BB)x/
    abcx
 0: abcx
    aBCx
 0: aBCx
    bbx
 0: bbx
    BBx
 0: BBx
    *** Failers
No match
    abcX
No match
    aBCX
No match
    bbX
No match
    BBX               
No match

/^([ab](?i)[cd]|[ef])/
    ac
 0: ac
    aC
 0: aC
    bD
 0: bD
    elephant
 0: e
    Europe 
 0: E
    frog
 0: f
    France
 0: F
    *** Failers
No match
    Africa     
No match

/^(ab|a(?i)[b-c](?m-i)d|x(?i)y|z)/
    ab
 0: ab
    aBd
 0: aBd
    xy
 0: xy
    xY
 0: xY
    zebra
 0: z
    Zambesi
 0: Z
    *** Failers
No match
    aCD  
No match
    XY  
No match

/(?<=foo\n)^bar/m
    foo\nbar
 0: bar
    *** Failers
No match
    bar
No match
    baz\nbar   
No match

/(?<=(?<!foo)bar)baz/
    barbaz
 0: baz
    barbarbaz 
 0: baz
    koobarbaz 
 0: baz
    *** Failers
No match
    baz
No match
    foobarbaz 
No match

/The following tests are taken from the Perl 5.005 test suite; some of them/
/are compatible with 5.004, but I'd rather not have to sort them out./
No match

/abc/
    abc
 0: abc
    xabcy
 0: abc
    ababc
 0: abc
    *** Failers
No match
    xbc
No match
    axc
No match
    abx
No match

/ab*c/
    abc
 0: abc

/ab*bc/
    abc
 0: abc
    abbc
 0: abbc
    abbbbc
 0: abbbbc

/.{1}/
    abbbbc
 0: a

/.{3,4}/
    abbbbc
 0: abbb
 1: abb

/ab{0,}bc/
    abbbbc
 0: abbbbc

/ab+bc/
    abbc
 0: abbc
    *** Failers
No match
    abc
No match
    abq
No match

/ab{1,}bc/

/ab+bc/
    abbbbc
 0: abbbbc

/ab{1,}bc/
    abbbbc
 0: abbbbc

/ab{1,3}bc/
    abbbbc
 0: abbbbc

/ab{3,4}bc/
    abbbbc
 0: abbbbc

/ab{4,5}bc/
    *** Failers
No match
    abq
No match
    abbbbc
No match

/ab?bc/
    abbc
 0: abbc
    abc
 0: abc

/ab{0,1}bc/
    abc
 0: abc

/ab?bc/

/ab?c/
    abc
 0: abc

/ab{0,1}c/
    abc
 0: abc

/^abc$/
    abc
 0: abc
    *** Failers
No match
    abbbbc
No match
    abcc
No match

/^abc/
    abcc
 0: abc

/^abc$/

/abc$/
    aabc
 0: abc
    *** Failers
No match
    aabc
 0: abc
    aabcd
No match

/^/
    abc
 0: 

/$/
    abc
 0: 

/a.c/
    abc
 0: abc
    axc
 0: axc

/a.*c/
    axyzc
 0: axyzc

/a[bc]d/
    abd
 0: abd
    *** Failers
No match
    axyzd
No match
    abc
No match

/a[b-d]e/
    ace
 0: ace

/a[b-d]/
    aac
 0: ac

/a[-b]/
    a-
 0: a-

/a[b-]/
    a-
 0: a-

/a]/
    a]
 0: a]

/a[]]b/
    a]b
 0: a]b

/a[^bc]d/
    aed
 0: aed
    *** Failers
No match
    abd
No match
    abd
No match

/a[^-b]c/
    adc
 0: adc

/a[^]b]c/
    adc
 0: adc
    *** Failers
No match
    a-c
 0: a-c
    a]c
No match

/\ba\b/
    a-
 0: a
    -a
 0: a
    -a-
 0: a

/\by\b/
    *** Failers
No match
    xy
No match
    yz
No match
    xyz
No match

/\Ba\B/
    *** Failers
 0: a
    a-
No match
    -a
No match
    -a-
No match

/\By\b/
    xy
 0: y

/\by\B/
    yz
 0: y

/\By\B/
    xyz
 0: y

/\w/
    a
 0: a

/\W/
    -
 0: -
    *** Failers
 0: *
    -
 0: -
    a
No match

/a\sb/
    a b
 0: a b

/a\Sb/
    a-b
 0: a-b
    *** Failers
No match
    a-b
 0: a-b
    a b
No match

/\d/
    1
 0: 1

/\D/
    -
 0: -
    *** Failers
 0: *
    -
 0: -
    1
No match

/[\w]/
    a
 0: a

/[\W]/
    -
 0: -
    *** Failers
 0: *
    -
 0: -
    a
No match

/a[\s]b/
    a b
 0: a b

/a[\S]b/
    a-b
 0: a-b
    *** Failers
No match
    a-b
 0: a-b
    a b
No match

/[\d]/
    1
 0: 1

/[\D]/
    -
 0: -
    *** Failers
 0: *
    -
 0: -
    1
No match

/ab|cd/
    abc
 0: ab
    abcd
 0: ab

/()ef/
    def
 0: ef

/$b/

/a\(b/
    a(b
 0: a(b

/a\(*b/
    ab
 0: ab
    a((b
 0: a((b

/a\\b/
    a\b
No match

/((a))/
    abc
 0: a

/(a)b(c)/
    abc
 0: abc

/a+b+c/
    aabbabc
 0: abc

/a{1,}b{1,}c/
    aabbabc
 0: abc

/a.+?c/
    abcabc
 0: abcabc
 1: abc

/(a+|b)*/
    ab
 0: ab
 1: a
 2: 

/(a+|b){0,}/
    ab
 0: ab
 1: a
 2: 

/(a+|b)+/
    ab
 0: ab
 1: a

/(a+|b){1,}/
    ab
 0: ab
 1: a

/(a+|b)?/
    ab
 0: a
 1: 

/(a+|b){0,1}/
    ab
 0: a
 1: 

/[^ab]*/
    cde
 0: cde
 1: cd
 2: c
 3: 

/abc/
    *** Failers
No match
    b
No match
    

/a*/
    

/([abc])*d/
    abbbcd
 0: abbbcd

/([abc])*bcd/
    abcd
 0: abcd

/a|b|c|d|e/
    e
 0: e

/(a|b|c|d|e)f/
    ef
 0: ef

/abcd*efg/
    abcdefg
 0: abcdefg

/ab*/
    xabyabbbz
 0: ab
 1: a
    xayabbbz
 0: a

/(ab|cd)e/
    abcde
 0: cde

/[abhgefdc]ij/
    hij
 0: hij

/^(ab|cd)e/

/(abc|)ef/
    abcdef
 0: ef

/(a|b)c*d/
    abcd
 0: bcd

/(ab|ab*)bc/
    abc
 0: abc

/a([bc]*)c*/
    abc
 0: abc
 1: ab
 2: a

/a([bc]*)(c*d)/
    abcd
 0: abcd

/a([bc]+)(c*d)/
    abcd
 0: abcd

/a([bc]*)(c+d)/
    abcd
 0: abcd

/a[bcd]*dcdcde/
    adcdcde
 0: adcdcde

/a[bcd]+dcdcde/
    *** Failers
No match
    abcde
No match
    adcdcde
No match

/(ab|a)b*c/
    abc
 0: abc

/((a)(b)c)(d)/
    abcd
 0: abcd

/[a-zA-Z_][a-zA-Z0-9_]*/
    alpha
 0: alpha
 1: alph
 2: alp
 3: al
 4: a

/^a(bc+|b[eh])g|.h$/
    abh
 0: bh

/(bc+d$|ef*g.|h?i(j|k))/
    effgz
 0: effgz
    ij
 0: ij
    reffgz
 0: effgz
    *** Failers
No match
    effg
No match
    bcdd
No match

/((((((((((a))))))))))/
    a
 0: a

/(((((((((a)))))))))/
    a
 0: a

/multiple words of text/
    *** Failers
No match
    aa
No match
    uh-uh
No match

/multiple words/
    multiple words, yeah
 0: multiple words

/(.*)c(.*)/
    abcde
 0: abcde
 1: abcd
 2: abc

/\((.*), (.*)\)/
    (a, b)
 0: (a, b)

/[k]/

/abcd/
    abcd
 0: abcd

/a(bc)d/
    abcd
 0: abcd

/a[-]?c/
    ac
 0: ac

/abc/i
    ABC
 0: ABC
    XABCY
 0: ABC
    ABABC
 0: ABC
    *** Failers
No match
    aaxabxbaxbbx
No match
    XBC
No match
    AXC
No match
    ABX
No match

/ab*c/i
    ABC
 0: ABC

/ab*bc/i
    ABC
 0: ABC
    ABBC
 0: ABBC

/ab*?bc/i
    ABBBBC
 0: ABBBBC

/ab{0,}?bc/i
    ABBBBC
 0: ABBBBC

/ab+?bc/i
    ABBC
 0: ABBC

/ab+bc/i
    *** Failers
No match
    ABC
No match
    ABQ
No match

/ab{1,}bc/i

/ab+bc/i
    ABBBBC
 0: ABBBBC

/ab{1,}?bc/i
    ABBBBC
 0: ABBBBC

/ab{1,3}?bc/i
    ABBBBC
 0: ABBBBC

/ab{3,4}?bc/i
    ABBBBC
 0: ABBBBC

/ab{4,5}?bc/i
    *** Failers
No match
    ABQ
No match
    ABBBBC
No match

/ab??bc/i
    ABBC
 0: ABBC
    ABC
 0: ABC

/ab{0,1}?bc/i
    ABC
 0: ABC

/ab??bc/i

/ab??c/i
    ABC
 0: ABC

/ab{0,1}?c/i
    ABC
 0: ABC

/^abc$/i
    ABC
 0: ABC
    *** Failers
No match
    ABBBBC
No match
    ABCC
No match

/^abc/i
    ABCC
 0: ABC

/^abc$/i

/abc$/i
    AABC
 0: ABC

/^/i
    ABC
 0: 

/$/i
    ABC
 0: 

/a.c/i
    ABC
 0: ABC
    AXC
 0: AXC

/a.*?c/i
    AXYZC
 0: AXYZC

/a.*c/i
    *** Failers
No match
    AABC
 0: AABC
    AXYZD
No match

/a[bc]d/i
    ABD
 0: ABD

/a[b-d]e/i
    ACE
 0: ACE
    *** Failers
No match
    ABC
No match
    ABD
No match

/a[b-d]/i
    AAC
 0: AC

/a[-b]/i
    A-
 0: A-

/a[b-]/i
    A-
 0: A-

/a]/i
    A]
 0: A]

/a[]]b/i
    A]B
 0: A]B

/a[^bc]d/i
    AED
 0: AED

/a[^-b]c/i
    ADC
 0: ADC
    *** Failers
No match
    ABD
No match
    A-C
No match

/a[^]b]c/i
    ADC
 0: ADC

/ab|cd/i
    ABC
 0: AB
    ABCD
 0: AB

/()ef/i
    DEF
 0: EF

/$b/i
    *** Failers
No match
    A]C
No match
    B
No match

/a\(b/i
    A(B
 0: A(B

/a\(*b/i
    AB
 0: AB
    A((B
 0: A((B

/a\\b/i
    A\B
No match

/((a))/i
    ABC
 0: A

/(a)b(c)/i
    ABC
 0: ABC

/a+b+c/i
    AABBABC
 0: ABC

/a{1,}b{1,}c/i
    AABBABC
 0: ABC

/a.+?c/i
    ABCABC
 0: ABCABC
 1: ABC

/a.*?c/i
    ABCABC
 0: ABCABC
 1: ABC

/a.{0,5}?c/i
    ABCABC
 0: ABCABC
 1: ABC

/(a+|b)*/i
    AB
 0: AB
 1: A
 2: 

/(a+|b){0,}/i
    AB
 0: AB
 1: A
 2: 

/(a+|b)+/i
    AB
 0: AB
 1: A

/(a+|b){1,}/i
    AB
 0: AB
 1: A

/(a+|b)?/i
    AB
 0: A
 1: 

/(a+|b){0,1}/i
    AB
 0: A
 1: 

/(a+|b){0,1}?/i
    AB
 0: A
 1: 

/[^ab]*/i
    CDE
 0: CDE
 1: CD
 2: C
 3: 

/abc/i

/a*/i
    

/([abc])*d/i
    ABBBCD
 0: ABBBCD

/([abc])*bcd/i
    ABCD
 0: ABCD

/a|b|c|d|e/i
    E
 0: E

/(a|b|c|d|e)f/i
    EF
 0: EF

/abcd*efg/i
    ABCDEFG
 0: ABCDEFG

/ab*/i
    XABYABBBZ
 0: AB
 1: A
    XAYABBBZ
 0: A

/(ab|cd)e/i
    ABCDE
 0: CDE

/[abhgefdc]ij/i
    HIJ
 0: HIJ

/^(ab|cd)e/i
    ABCDE
No match

/(abc|)ef/i
    ABCDEF
 0: EF

/(a|b)c*d/i
    ABCD
 0: BCD

/(ab|ab*)bc/i
    ABC
 0: ABC

/a([bc]*)c*/i
    ABC
 0: ABC
 1: AB
 2: A

/a([bc]*)(c*d)/i
    ABCD
 0: ABCD

/a([bc]+)(c*d)/i
    ABCD
 0: ABCD

/a([bc]*)(c+d)/i
    ABCD
 0: ABCD

/a[bcd]*dcdcde/i
    ADCDCDE
 0: ADCDCDE

/a[bcd]+dcdcde/i

/(ab|a)b*c/i
    ABC
 0: ABC

/((a)(b)c)(d)/i
    ABCD
 0: ABCD

/[a-zA-Z_][a-zA-Z0-9_]*/i
    ALPHA
 0: ALPHA
 1: ALPH
 2: ALP
 3: AL
 4: A

/^a(bc+|b[eh])g|.h$/i
    ABH
 0: BH

/(bc+d$|ef*g.|h?i(j|k))/i
    EFFGZ
 0: EFFGZ
    IJ
 0: IJ
    REFFGZ
 0: EFFGZ
    *** Failers
No match
    ADCDCDE
No match
    EFFG
No match
    BCDD
No match

/((((((((((a))))))))))/i
    A
 0: A

/(((((((((a)))))))))/i
    A
 0: A

/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a))))))))))/i
    A
 0: A

/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a|b|c))))))))))/i
    C
 0: C

/multiple words of text/i
    *** Failers
No match
    AA
No match
    UH-UH
No match

/multiple words/i
    MULTIPLE WORDS, YEAH
 0: MULTIPLE WORDS

/(.*)c(.*)/i
    ABCDE
 0: ABCDE
 1: ABCD
 2: ABC

/\((.*), (.*)\)/i
    (A, B)
 0: (A, B)

/[k]/i

/abcd/i
    ABCD
 0: ABCD

/a(bc)d/i
    ABCD
 0: ABCD

/a[-]?c/i
    AC
 0: AC

/a(?!b)./
    abad
 0: ad

/a(?=d)./
    abad
 0: ad

/a(?=c|d)./
    abad
 0: ad

/a(?:b|c|d)(.)/
    ace
 0: ace

/a(?:b|c|d)*(.)/
    ace
 0: ace
 1: ac

/a(?:b|c|d)+?(.)/
    ace
 0: ace
    acdbcdbe
 0: acdbcdbe
 1: acdbcdb
 2: acdbcd
 3: acdbc
 4: acdb
 5: acd

/a(?:b|c|d)+(.)/
    acdbcdbe
 0: acdbcdbe
 1: acdbcdb
 2: acdbcd
 3: acdbc
 4: acdb
 5: acd

/a(?:b|c|d){2}(.)/
    acdbcdbe
 0: acdb

/a(?:b|c|d){4,5}(.)/
    acdbcdbe
 0: acdbcdb
 1: acdbcd

/a(?:b|c|d){4,5}?(.)/
    acdbcdbe
 0: acdbcdb
 1: acdbcd

/((foo)|(bar))*/
    foobar
 0: foobar
 1: foo
 2: 

/a(?:b|c|d){6,7}(.)/
    acdbcdbe
 0: acdbcdbe

/a(?:b|c|d){6,7}?(.)/
    acdbcdbe
 0: acdbcdbe

/a(?:b|c|d){5,6}(.)/
    acdbcdbe
 0: acdbcdbe
 1: acdbcdb

/a(?:b|c|d){5,6}?(.)/
    acdbcdbe
 0: acdbcdbe
 1: acdbcdb

/a(?:b|c|d){5,7}(.)/
    acdbcdbe
 0: acdbcdbe
 1: acdbcdb

/a(?:b|c|d){5,7}?(.)/
    acdbcdbe
 0: acdbcdbe
 1: acdbcdb

/a(?:b|(c|e){1,2}?|d)+?(.)/
    ace
 0: ace

/^(.+)?B/
    AB
 0: AB

/^([^a-z])|(\^)$/
    .
 0: .

/^[<>]&/
    <&OUT
 0: <&

/(?:(f)(o)(o)|(b)(a)(r))*/
    foobar
 0: foobar
 1: foo
 2: 

/(?<=a)b/
    ab
 0: b
    *** Failers
No match
    cb
No match
    b
No match

/(?<!c)b/
    ab
 0: b
    b
 0: b
    b
 0: b

/(?:..)*a/
    aba
 0: aba
 1: a

/(?:..)*?a/
    aba
 0: aba
 1: a

/^(){3,5}/
    abc
 0: 

/^(a+)*ax/
    aax
 0: aax

/^((a|b)+)*ax/
    aax
 0: aax

/^((a|bc)+)*ax/
    aax
 0: aax

/(a|x)*ab/
    cab
 0: ab

/(a)*ab/
    cab
 0: ab

/(?:(?i)a)b/
    ab
 0: ab

/((?i)a)b/
    ab
 0: ab

/(?:(?i)a)b/
    Ab
 0: Ab

/((?i)a)b/
    Ab
 0: Ab

/(?:(?i)a)b/
    *** Failers
No match
    cb
No match
    aB
No match

/((?i)a)b/

/(?i:a)b/
    ab
 0: ab

/((?i:a))b/
    ab
 0: ab

/(?i:a)b/
    Ab
 0: Ab

/((?i:a))b/
    Ab
 0: Ab

/(?i:a)b/
    *** Failers
No match
    aB
No match
    aB
No match

/((?i:a))b/

/(?:(?-i)a)b/i
    ab
 0: ab

/((?-i)a)b/i
    ab
 0: ab

/(?:(?-i)a)b/i
    aB
 0: aB

/((?-i)a)b/i
    aB
 0: aB

/(?:(?-i)a)b/i
    *** Failers
No match
    aB
 0: aB
    Ab
No match

/((?-i)a)b/i

/(?:(?-i)a)b/i
    aB
 0: aB

/((?-i)a)b/i
    aB
 0: aB

/(?:(?-i)a)b/i
    *** Failers
No match
    Ab
No match
    AB
No match

/((?-i)a)b/i

/(?-i:a)b/i
    ab
 0: ab

/((?-i:a))b/i
    ab
 0: ab

/(?-i:a)b/i
    aB
 0: aB

/((?-i:a))b/i
    aB
 0: aB

/(?-i:a)b/i
    *** Failers
No match
    AB
No match
    Ab
No match

/((?-i:a))b/i

/(?-i:a)b/i
    aB
 0: aB

/((?-i:a))b/i
    aB
 0: aB

/(?-i:a)b/i
    *** Failers
No match
    Ab
No match
    AB
No match

/((?-i:a))b/i

/((?-i:a.))b/i
    *** Failers
No match
    AB
No match
    a\nB
No match

/((?s-i:a.))b/i
    a\nB
 0: a\x0aB

/(?:c|d)(?:)(?:a(?:)(?:b)(?:b(?:))(?:b(?:)(?:b)))/
    cabbbb
 0: cabbbb

/(?:c|d)(?:)(?:aaaaaaaa(?:)(?:bbbbbbbb)(?:bbbbbbbb(?:))(?:bbbbbbbb(?:)(?:bbbbbbbb)))/
    caaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
 0: caaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

/foo\w*\d{4}baz/
    foobar1234baz
 0: foobar1234baz

/x(~~)*(?:(?:F)?)?/
    x~~
 0: x~~
 1: x

/^a(?#xxx){3}c/
    aaac
 0: aaac

/^a (?#xxx) (?#yyy) {3}c/x
    aaac
 0: aaac

/(?<![cd])b/
    *** Failers
No match
    B\nB
No match
    dbcb
No match

/(?<![cd])[ab]/
    dbaacb
 0: a

/(?<!(c|d))b/

/(?<!(c|d))[ab]/
    dbaacb
 0: a

/(?<!cd)[ab]/
    cdaccb
 0: b

/^(?:a?b?)*$/
    *** Failers
No match
    dbcb
No match
    a--
No match

/((?s)^a(.))((?m)^b$)/
    a\nb\nc\n
 0: a\x0ab

/((?m)^b$)/
    a\nb\nc\n
 0: b

/(?m)^b/
    a\nb\n
 0: b

/(?m)^(b)/
    a\nb\n
 0: b

/((?m)^b)/
    a\nb\n
 0: b

/\n((?m)^b)/
    a\nb\n
 0: \x0ab

/((?s).)c(?!.)/
    a\nb\nc\n
 0: \x0ac
    a\nb\nc\n
 0: \x0ac

/((?s)b.)c(?!.)/
    a\nb\nc\n
 0: b\x0ac
    a\nb\nc\n
 0: b\x0ac

/^b/

/()^b/
    *** Failers
No match
    a\nb\nc\n
No match
    a\nb\nc\n
No match

/((?m)^b)/
    a\nb\nc\n
 0: b

/(?(?!a)a|b)/

/(?(?!a)b|a)/
    a
 0: a

/(?(?=a)b|a)/
    *** Failers
No match
    a
No match
    a
No match

/(?(?=a)a|b)/
    a
 0: a

/(\w+:)+/
    one:
 0: one:

/$(?<=^(a))/
    a
 0: 

/([\w:]+::)?(\w+)$/
    abcd
 0: abcd
    xy:z:::abcd
 0: xy:z:::abcd

/^[^bcd]*(c+)/
    aexycd
 0: aexyc

/(a*)b+/
    caab
 0: aab

/([\w:]+::)?(\w+)$/
    abcd
 0: abcd
    xy:z:::abcd
 0: xy:z:::abcd
    *** Failers
 0: Failers
    abcd:
No match
    abcd:
No match

/^[^bcd]*(c+)/
    aexycd
 0: aexyc

/(>a+)ab/

/(?>a+)b/
    aaab
 0: aaab

/([[:]+)/
    a:[b]:
 0: :[
 1: :

/([[=]+)/
    a=[b]=
 0: =[
 1: =

/([[.]+)/
    a.[b].
 0: .[
 1: .

/((?>a+)b)/
    aaab
 0: aaab

/(?>(a+))b/
    aaab
 0: aaab

/((?>[^()]+)|\([^()]*\))+/
    ((abc(ade)ufh()()x
 0: abc(ade)ufh()()x
 1: abc(ade)ufh()()
 2: abc(ade)ufh()
 3: abc(ade)ufh
 4: abc(ade)
 5: abc

/a\Z/
    *** Failers
No match
    aaab
No match
    a\nb\n
No match

/b\Z/
    a\nb\n
 0: b

/b\z/

/b\Z/
    a\nb
 0: b

/b\z/
    a\nb
 0: b
    *** Failers
No match
    
/(?>.*)(?<=(abcd|wxyz))/
    alphabetabcd
 0: alphabetabcd
    endingwxyz
 0: endingwxyz
    *** Failers
No match
    a rather long string that doesn't end with one of them
No match

/word (?>(?:(?!otherword)[a-zA-Z0-9]+ ){0,30})otherword/
    word cat dog elephant mussel cow horse canary baboon snake shark otherword
 0: word cat dog elephant mussel cow horse canary baboon snake shark otherword
    word cat dog elephant mussel cow horse canary baboon snake shark
No match
  
/word (?>[a-zA-Z0-9]+ ){0,30}otherword/
    word cat dog elephant mussel cow horse canary baboon snake shark the quick brown fox and the lazy dog and several other words getting close to thirty by now I hope
No match

/(?<=\d{3}(?!999))foo/
    999foo
 0: foo
    123999foo 
 0: foo
    *** Failers
No match
    123abcfoo
No match
    
/(?<=(?!...999)\d{3})foo/
    999foo
 0: foo
    123999foo 
 0: foo
    *** Failers
No match
    123abcfoo
No match

/(?<=\d{3}(?!999)...)foo/
    123abcfoo
 0: foo
    123456foo 
 0: foo
    *** Failers
No match
    123999foo  
No match
    
/(?<=\d{3}...)(?<!999)foo/
    123abcfoo   
 0: foo
    123456foo 
 0: foo
    *** Failers
No match
    123999foo  
No match

/((Z)+|A)*/
    ZABCDEFG
 0: ZA
 1: Z
 2: 

/(Z()|A)*/
    ZABCDEFG
 0: ZA
 1: Z
 2: 

/(Z(())|A)*/
    ZABCDEFG
 0: ZA
 1: Z
 2: 

/((?>Z)+|A)*/
    ZABCDEFG
 0: ZA
 1: Z
 2: 

/((?>)+|A)*/
    ZABCDEFG
 0: 

/a*/g
    abbab
 0: a
 1: 
 0: 
 0: 
 0: a
 1: 
 0: 
 0: 

/^[a-\d]/
    abcde
 0: a
    -things
 0: -
    0digit
 0: 0
    *** Failers
No match
    bcdef    
No match

/^[\d-a]/
    abcde
 0: a
    -things
 0: -
    0digit
 0: 0
    *** Failers
No match
    bcdef    
No match
    
/[[:space:]]+/
    > \x09\x0a\x0c\x0d\x0b<
 0:  \x09\x0a\x0c\x0d\x0b
 1:  \x09\x0a\x0c\x0d
 2:  \x09\x0a\x0c
 3:  \x09\x0a
 4:  \x09
 5:  
     
/[[:blank:]]+/
    > \x09\x0a\x0c\x0d\x0b<
 0:  \x09
 1:  
     
/[\s]+/
    > \x09\x0a\x0c\x0d\x0b<
 0:  \x09\x0a\x0c\x0d
 1:  \x09\x0a\x0c
 2:  \x09\x0a
 3:  \x09
 4:  
     
/\s+/
    > \x09\x0a\x0c\x0d\x0b<
 0:  \x09\x0a\x0c\x0d
 1:  \x09\x0a\x0c
 2:  \x09\x0a
 3:  \x09
 4:  
     
/ab/x
    ab
No match

/(?!\A)x/m
  a\nxb\n
 0: x

/(?!^)x/m
  a\nxb\n
No match

/abc\Qabc\Eabc/
    abcabcabc
 0: abcabcabc
    
/abc\Q(*+|\Eabc/
    abc(*+|abc 
 0: abc(*+|abc

/   abc\Q abc\Eabc/x
    abc abcabc
 0: abc abcabc
    *** Failers
No match
    abcabcabc  
No match
    
/abc#comment
    \Q#not comment
    literal\E/x
    abc#not comment\n    literal     
 0: abc#not comment\x0a    literal

/abc#comment
    \Q#not comment
    literal/x
    abc#not comment\n    literal     
 0: abc#not comment\x0a    literal

/abc#comment
    \Q#not comment
    literal\E #more comment
    /x
    abc#not comment\n    literal     
 0: abc#not comment\x0a    literal

/abc#comment
    \Q#not comment
    literal\E #more comment/x
    abc#not comment\n    literal     
 0: abc#not comment\x0a    literal

/\Qabc\$xyz\E/
    abc\\\$xyz
 0: abc\$xyz

/\Qabc\E\$\Qxyz\E/
    abc\$xyz
 0: abc$xyz

/\Gabc/
    abc
 0: abc
    *** Failers
No match
    xyzabc  
No match

/\Gabc./g
    abc1abc2xyzabc3
 0: abc1
 0: abc2

/abc./g
    abc1abc2xyzabc3 
 0: abc1
 0: abc2
 0: abc3

/a(?x: b c )d/
    XabcdY
 0: abcd
    *** Failers 
No match
    Xa b c d Y 
No match

/((?x)x y z | a b c)/
    XabcY
 0: abc
    AxyzB 
 0: xyz

/(?i)AB(?-i)C/
    XabCY
 0: abC
    *** Failers
No match
    XabcY  
No match

/((?i)AB(?-i)C|D)E/
    abCE
 0: abCE
    DE
 0: DE
    *** Failers
No match
    abcE
No match
    abCe  
No match
    dE
No match
    De    
No match

/[z\Qa-d]\E]/
    z
 0: z
    a
 0: a
    -
 0: -
    d
 0: d
    ] 
 0: ]
    *** Failers
 0: a
    b     
No match

/[\z\C]/
    z
 0: z
    C 
 0: C
    
/\M/
    M 
 0: M
    
/(a+)*b/
    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
No match
    
/(?i)reg(?:ul(?:[aд]|ae)r|ex)/
    REGular
 0: REGular
    regulaer
 0: regulaer
    Regex  
 0: Regex
    regulдr 
 0: regul\xe4r

/≈жед[а-€ј-я]+/
    ≈жеда
 0: \xc5\xe6\xe5\xe4\xe0
    ≈жед€
 0: \xc5\xe6\xe5\xe4\xff
    ≈жедј
 0: \xc5\xe6\xe5\xe4\xc0
    ≈жедя
 0: \xc5\xe6\xe5\xe4\xdf

/(?<=Z)X./
    \x84XAZXB
 0: XB

/^(?(2)a|(1)(2))+$/
    123a
Error -17

/(?<=a|bbbb)c/
    ac
 0: c
    bbbbc
 0: c

/abc/>testsavedregex
Compiled regex written to testsavedregex
<testsavedregex
Compiled regex loaded from testsavedregex
No study data
    abc
 0: abc
    *** Failers
No match
    bca
No match
    
/abc/F>testsavedregex
Compiled regex written to testsavedregex
<testsavedregex
Compiled regex (byte-inverted) loaded from testsavedregex
No study data
    abc
 0: abc
    *** Failers
No match
    bca
No match

/(a|b)/S>testsavedregex
Compiled regex written to testsavedregex
Study data written to testsavedregex
<testsavedregex
Compiled regex loaded from testsavedregex
Study data loaded from testsavedregex
    abc
 0: a
    *** Failers
 0: a
    def  
No match
    
/(a|b)/SF>testsavedregex
Compiled regex written to testsavedregex
Study data written to testsavedregex
<testsavedregex
Compiled regex (byte-inverted) loaded from testsavedregex
Study data loaded from testsavedregex
    abc
 0: a
    *** Failers
 0: a
    def  
No match
    
/line\nbreak/
    this is a line\nbreak
 0: line\x0abreak
    line one\nthis is a line\nbreak in the second line 
 0: line\x0abreak

/line\nbreak/f
    this is a line\nbreak
 0: line\x0abreak
    ** Failers 
No match
    line one\nthis is a line\nbreak in the second line 
No match

/line\nbreak/mf
    this is a line\nbreak
 0: line\x0abreak
    ** Failers 
No match
    line one\nthis is a line\nbreak in the second line 
No match

/1234/
    123\P
Partial match: 123
    a4\P\R
No match

/1234/
    123\P
Partial match: 123
    4\P\R
 0: 4

/^/mg
    a\nb\nc\n
 0: 
 0: 
 0: 
    \ 
 0: 
    
/(?<=C\n)^/mg
    A\nC\nC\n 
 0: 

/(?s)A?B/
    AB
 0: AB
    aB  
 0: B

/(?s)A*B/
    AB
 0: AB
    aB  
 0: B

/(?m)A?B/
    AB
 0: AB
    aB  
 0: B

/(?m)A*B/
    AB
 0: AB
    aB  
 0: B

/Content-Type\x3A[^\r\n]{6,}/
    Content-Type:xxxxxyyy 
 0: Content-Type:xxxxxyyy
 1: Content-Type:xxxxxyy
 2: Content-Type:xxxxxy

/Content-Type\x3A[^\r\n]{6,}z/
    Content-Type:xxxxxyyyz
 0: Content-Type:xxxxxyyyz

/Content-Type\x3A[^a]{6,}/
    Content-Type:xxxyyy 
 0: Content-Type:xxxyyy

/Content-Type\x3A[^a]{6,}z/
    Content-Type:xxxyyyz
 0: Content-Type:xxxyyyz

/^abc/m
    xyz\nabc
 0: abc
    xyz\nabc\<lf>
 0: abc
    xyz\r\nabc\<lf>
 0: abc
    xyz\rabc\<cr>
 0: abc
    xyz\r\nabc\<crlf>
 0: abc
    ** Failers 
No match
    xyz\nabc\<cr>
No match
    xyz\r\nabc\<cr>
No match
    xyz\nabc\<crlf>
No match
    xyz\rabc\<crlf>
No match
    xyz\rabc\<lf>
No match
    
/abc$/m<lf>
    xyzabc
 0: abc
    xyzabc\n 
 0: abc
    xyzabc\npqr 
 0: abc
    xyzabc\r\<cr> 
 0: abc
    xyzabc\rpqr\<cr> 
 0: abc
    xyzabc\r\n\<crlf> 
 0: abc
    xyzabc\r\npqr\<crlf> 
 0: abc
    ** Failers
No match
    xyzabc\r 
No match
    xyzabc\rpqr 
No match
    xyzabc\r\n 
No match
    xyzabc\r\npqr 
No match
    
/^abc/m<cr>
    xyz\rabcdef
 0: abc
    xyz\nabcdef\<lf>
 0: abc
    ** Failers  
No match
    xyz\nabcdef
No match
       
/^abc/m<lf>
    xyz\nabcdef
 0: abc
    xyz\rabcdef\<cr>
 0: abc
    ** Failers  
No match
    xyz\rabcdef
No match
       
/^abc/m<crlf>
    xyz\r\nabcdef
 0: abc
    xyz\rabcdef\<cr>
 0: abc
    ** Failers  
No match
    xyz\rabcdef
No match
    
/.*/<lf>
    abc\ndef
 0: abc
 1: ab
 2: a
 3: 
    abc\rdef
 0: abc\x0ddef
 1: abc\x0dde
 2: abc\x0dd
 3: abc\x0d
 4: abc
 5: ab
 6: a
 7: 
    abc\r\ndef
 0: abc\x0d
 1: abc
 2: ab
 3: a
 4: 
    \<cr>abc\ndef
 0: abc\x0adef
 1: abc\x0ade
 2: abc\x0ad
 3: abc\x0a
 4: abc
 5: ab
 6: a
 7: 
    \<cr>abc\rdef
 0: abc
 1: ab
 2: a
 3: 
    \<cr>abc\r\ndef
 0: abc
 1: ab
 2: a
 3: 
    \<crlf>abc\ndef
 0: abc\x0adef
 1: abc\x0ade
 2: abc\x0ad
 3: abc\x0a
 4: abc
 5: ab
 6: a
 7: 
    \<crlf>abc\rdef
 0: abc\x0ddef
 1: abc\x0dde
 2: abc\x0dd
 3: abc\x0d
 4: abc
 5: ab
 6: a
 7: 
    \<crlf>abc\r\ndef
 0: abc
 1: ab
 2: a
 3: 

/\w+(.)(.)?def/s
    abc\ndef
 0: abc\x0adef
    abc\rdef
 0: abc\x0ddef
    abc\r\ndef
 0: abc\x0d\x0adef

/^\w+=.*(\\\n.*)*/
    abc=xyz\\\npqr
 0: abc=xyz\\x0apqr
 1: abc=xyz\\x0apq
 2: abc=xyz\\x0ap
 3: abc=xyz\\x0a
 4: abc=xyz\
 5: abc=xyz
 6: abc=xy
 7: abc=x
 8: abc=

/^(a()*)*/
    aaaa
 0: aaaa
 1: aaa
 2: aa
 3: a
 4: 

/^(?:a(?:(?:))*)*/
    aaaa
 0: aaaa
 1: aaa
 2: aa
 3: a
 4: 

/^(a()+)+/
    aaaa
 0: aaaa
 1: aaa
 2: aa
 3: a

/^(?:a(?:(?:))+)+/
    aaaa
 0: aaaa
 1: aaa
 2: aa
 3: a

/(a|)*\d/
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
No match
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4
 0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4

/(?>a|)*\d/
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
No match
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4
 0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4

/(?:a|)*\d/
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
No match
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4
 0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4

/^a.b/<lf>
    a\rb
 0: a\x0db
    a\nb\<cr> 
 0: a\x0ab
    ** Failers
No match
    a\nb
No match
    a\nb\<any>
No match
    a\rb\<cr>   
No match
    a\rb\<any>   
No match

/^abc./mgx<any>
    abc1 \x0aabc2 \x0babc3xx \x0cabc4 \x0dabc5xx \x0d\x0aabc6 \x85abc7 JUNK
 0: abc1
 0: abc2
 0: abc3
 0: abc4
 0: abc5
 0: abc6
 0: abc7

/abc.$/mgx<any>
    abc1\x0a abc2\x0b abc3\x0c abc4\x0d abc5\x0d\x0a abc6\x85 abc9
 0: abc1
 0: abc2
 0: abc3
 0: abc4
 0: abc5
 0: abc6
 0: abc9

/^a\Rb/<bsr_unicode>
    a\nb
 0: a\x0ab
    a\rb
 0: a\x0db
    a\r\nb
 0: a\x0d\x0ab
    a\x0bb
 0: a\x0bb
    a\x0cb
 0: a\x0cb
    a\x85b   
 0: a\x85b
    ** Failers
No match
    a\n\rb    
No match

/^a\R*b/<bsr_unicode>
    ab
 0: ab
    a\nb
 0: a\x0ab
    a\rb
 0: a\x0db
    a\r\nb
 0: a\x0d\x0ab
    a\x0bb
 0: a\x0bb
    a\x0cb
 0: a\x0cb
    a\x85b   
 0: a\x85b
    a\n\rb    
 0: a\x0a\x0db
    a\n\r\x85\x0cb 
 0: a\x0a\x0d\x85\x0cb

/^a\R+b/<bsr_unicode>
    a\nb
 0: a\x0ab
    a\rb
 0: a\x0db
    a\r\nb
 0: a\x0d\x0ab
    a\x0bb
 0: a\x0bb
    a\x0cb
 0: a\x0cb
    a\x85b   
 0: a\x85b
    a\n\rb    
 0: a\x0a\x0db
    a\n\r\x85\x0cb 
 0: a\x0a\x0d\x85\x0cb
    ** Failers
No match
    ab  
No match
    
/^a\R{1,3}b/<bsr_unicode>
    a\nb
 0: a\x0ab
    a\n\rb
 0: a\x0a\x0db
    a\n\r\x85b
 0: a\x0a\x0d\x85b
    a\r\n\r\nb 
 0: a\x0d\x0a\x0d\x0ab
    a\r\n\r\n\r\nb 
 0: a\x0d\x0a\x0d\x0a\x0d\x0ab
    a\n\r\n\rb
 0: a\x0a\x0d\x0a\x0db
    a\n\n\r\nb 
 0: a\x0a\x0a\x0d\x0ab
    ** Failers
No match
    a\n\n\n\rb
No match
    a\r
No match

/^a[\R]b/<bsr_unicode>
    aRb
 0: aRb
    ** Failers
No match
    a\nb  
No match

/.+foo/
    afoo
 0: afoo
    ** Failers 
No match
    \r\nfoo 
No match
    \nfoo 
No match

/.+foo/<crlf>
    afoo
 0: afoo
    \nfoo 
 0: \x0afoo
    ** Failers 
No match
    \r\nfoo 
No match

/.+foo/<any>
    afoo
 0: afoo
    ** Failers 
No match
    \nfoo 
No match
    \r\nfoo 
No match

/.+foo/s
    afoo
 0: afoo
    \r\nfoo 
 0: \x0d\x0afoo
    \nfoo 
 0: \x0afoo

/^$/mg<any>
    abc\r\rxyz
 0: 
    abc\n\rxyz  
 0: 
    ** Failers 
No match
    abc\r\nxyz
No match

/^X/m
    XABC
 0: X
    ** Failers 
No match
    XABC\B
No match

/(?m)^$/<any>g+
    abc\r\n\r\n
 0: 
 0+ \x0d\x0a

/(?m)^$|^\r\n/<any>g+ 
    abc\r\n\r\n
 0: \x0d\x0a
 0+ 
 1: 
    
/(?m)$/<any>g+ 
    abc\r\n\r\n
 0: 
 0+ \x0d\x0a\x0d\x0a
 0: 
 0+ \x0d\x0a
 0: 
 0+ 

/(?|(abc)|(xyz))/
   >abc<
 0: abc
   >xyz< 
 0: xyz

/(x)(?|(abc)|(xyz))(x)/
    xabcx
 0: xabcx
    xxyzx 
 0: xxyzx

/(x)(?|(abc)(pqr)|(xyz))(x)/
    xabcpqrx
 0: xabcpqrx
    xxyzx 
 0: xxyzx

/(?|(abc)|(xyz))(?1)/
    abcabc
 0: abcabc
    xyzabc 
 0: xyzabc
    ** Failers 
No match
    xyzxyz 
No match
 
/\H\h\V\v/
    X X\x0a
 0: X X\x0a
    X\x09X\x0b
 0: X\x09X\x0b
    ** Failers
No match
    \xa0 X\x0a   
No match
    
/\H*\h+\V?\v{3,4}/ 
    \x09\x20\xa0X\x0a\x0b\x0c\x0d\x0a
 0: \x09 \xa0X\x0a\x0b\x0c\x0d
 1: \x09 \xa0X\x0a\x0b\x0c
    \x09\x20\xa0\x0a\x0b\x0c\x0d\x0a
 0: \x09 \xa0\x0a\x0b\x0c\x0d
 1: \x09 \xa0\x0a\x0b\x0c
    \x09\x20\xa0\x0a\x0b\x0c
 0: \x09 \xa0\x0a\x0b\x0c
    ** Failers 
No match
    \x09\x20\xa0\x0a\x0b
No match
     
/\H{3,4}/
    XY  ABCDE
 0: ABCD
 1: ABC
    XY  PQR ST 
 0: PQR
    
/.\h{3,4}./
    XY  AB    PQRS
 0: B    P
 1: B    

/\h*X\h?\H+Y\H?Z/
    >XNNNYZ
 0: XNNNYZ
    >  X NYQZ
 0:   X NYQZ
    ** Failers
No match
    >XYZ   
No match
    >  X NY Z
No match

/\v*X\v?Y\v+Z\V*\x0a\V+\x0b\V{2,3}\x0c/
    >XY\x0aZ\x0aA\x0bNN\x0c
 0: XY\x0aZ\x0aA\x0bNN\x0c
    >\x0a\x0dX\x0aY\x0a\x0bZZZ\x0aAAA\x0bNNN\x0c
 0: \x0a\x0dX\x0aY\x0a\x0bZZZ\x0aAAA\x0bNNN\x0c

/.+A/<crlf>
    \r\nA
No match
    
/\nA/<crlf>
    \r\nA 
 0: \x0aA

/[\r\n]A/<crlf>
    \r\nA 
 0: \x0aA

/(\r|\n)A/<crlf>
    \r\nA 
 0: \x0aA

/a\Rb/I<bsr_anycrlf>
Capturing subpattern count = 0
Options: bsr_anycrlf
First char = 'a'
Need char = 'b'
    a\rb
 0: a\x0db
    a\nb
 0: a\x0ab
    a\r\nb
 0: a\x0d\x0ab
    ** Failers
No match
    a\x85b
No match
    a\x0bb     
No match

/a\Rb/I<bsr_unicode>
Capturing subpattern count = 0
Options: bsr_unicode
First char = 'a'
Need char = 'b'
    a\rb
 0: a\x0db
    a\nb
 0: a\x0ab
    a\r\nb
 0: a\x0d\x0ab
    a\x85b
 0: a\x85b
    a\x0bb     
 0: a\x0bb
    ** Failers 
No match
    a\x85b\<bsr_anycrlf>
No match
    a\x0bb\<bsr_anycrlf>
No match
    
/a\R?b/I<bsr_anycrlf>
Capturing subpattern count = 0
Options: bsr_anycrlf
First char = 'a'
Need char = 'b'
    a\rb
 0: a\x0db
    a\nb
 0: a\x0ab
    a\r\nb
 0: a\x0d\x0ab
    ** Failers
No match
    a\x85b
No match
    a\x0bb     
No match

/a\R?b/I<bsr_unicode>
Capturing subpattern count = 0
Options: bsr_unicode
First char = 'a'
Need char = 'b'
    a\rb
 0: a\x0db
    a\nb
 0: a\x0ab
    a\r\nb
 0: a\x0d\x0ab
    a\x85b
 0: a\x85b
    a\x0bb     
 0: a\x0bb
    ** Failers 
No match
    a\x85b\<bsr_anycrlf>
No match
    a\x0bb\<bsr_anycrlf>
No match
    
/a\R{2,4}b/I<bsr_anycrlf>
Capturing subpattern count = 0
Partial matching not supported
Options: bsr_anycrlf
First char = 'a'
Need char = 'b'
    a\r\n\nb
 0: a\x0d\x0a\x0ab
    a\n\r\rb
 0: a\x0a\x0d\x0db
    a\r\n\r\n\r\n\r\nb
 0: a\x0d\x0a\x0d\x0a\x0d\x0a\x0d\x0ab
    ** Failers
No match
    a\x85\85b
No match
    a\x0b\0bb     
No match

/a\R{2,4}b/I<bsr_unicode>
Capturing subpattern count = 0
Partial matching not supported
Options: bsr_unicode
First char = 'a'
Need char = 'b'
    a\r\rb
 0: a\x0d\x0db
    a\n\n\nb
 0: a\x0a\x0a\x0ab
    a\r\n\n\r\rb
 0: a\x0d\x0a\x0a\x0d\x0db
    a\x85\85b
No match
    a\x0b\0bb     
No match
    ** Failers 
No match
    a\r\r\r\r\rb 
No match
    a\x85\85b\<bsr_anycrlf>
No match
    a\x0b\0bb\<bsr_anycrlf>
No match
    
/a(?!)|\wbc/
    abc 
 0: abc

/a[]b/<JS>
    ** Failers
No match
    ab
No match

/a[]+b/<JS>
    ** Failers
No match
    ab 
No match

/a[]*+b/<JS>
    ** Failers
No match
    ab 
No match

/a[^]b/<JS>
    aXb
 0: aXb
    a\nb 
 0: a\x0ab
    ** Failers
No match
    ab  
No match
    
/a[^]+b/<JS> 
    aXb
 0: aXb
    a\nX\nXb 
 0: a\x0aX\x0aXb
    ** Failers
No match
    ab  
No match

/ End of testinput7 /