/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…