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 1<html>
 2<head>
 3<title>pcre_study specification</title>
 4</head>
 5<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
 6<h1>pcre_study man page</h1>
 7<p>
 8Return to the <a href="index.html">PCRE index page</a>.
 9</p>
10<p>
11This page is part of the PCRE HTML documentation. It was generated automatically
12from the original man page. If there is any nonsense in it, please consult the
13man page, in case the conversion went wrong.
14<br>
15<br><b>
16SYNOPSIS
17</b><br>
18<P>
19<b>#include &#60;pcre.h&#62;</b>
20</P>
21<P>
22<b>pcre_extra *pcre_study(const pcre *<i>code</i>, int <i>options</i>,</b>
23<b>const char **<i>errptr</i>);</b>
24</P>
25<br><b>
26DESCRIPTION
27</b><br>
28<P>
29This function studies a compiled pattern, to see if additional information can
30be extracted that might speed up matching. Its arguments are:
31<pre>
32  <i>code</i>       A compiled regular expression
33  <i>options</i>    Options for <b>pcre_study()</b>
34  <i>errptr</i>     Where to put an error message
35</pre>
36If the function succeeds, it returns a value that can be passed to
37<b>pcre_exec()</b> via its <i>extra</i> argument.
38</P>
39<P>
40If the function returns NULL, either it could not find any additional
41information, or there was an error. You can tell the difference by looking at
42the error value. It is NULL in first case.
43</P>
44<P>
45There are currently no options defined; the value of the second argument should
46always be zero.
47</P>
48<P>
49There is a complete description of the PCRE native API in the
50<a href="pcreapi.html"><b>pcreapi</b></a>
51page and a description of the POSIX API in the
52<a href="pcreposix.html"><b>pcreposix</b></a>
53page.
54<p>
55Return to the <a href="index.html">PCRE index page</a>.
56</p>