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//usr/share/doc/pcre-devel/html/pcre_exec.html
<html>
<head>
<title>pcre_exec specification</title>
</head>
<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
<h1>pcre_exec man page</h1>
<p>
Return to the <a href="index.html">PCRE index page</a>.
</p>
<p>
This page is part of the PCRE HTML documentation. It was generated automatically
from the original man page. If there is any nonsense in it, please consult the
man page, in case the conversion went wrong.
<br>
<br><b>
SYNOPSIS
</b><br>
<P>
<b>#include &#60;pcre.h&#62;</b>
</P>
<P>
<b>int pcre_exec(const pcre *<i>code</i>, const pcre_extra *<i>extra</i>,</b>
<b>     const char *<i>subject</i>, int <i>length</i>, int <i>startoffset</i>,</b>
<b>     int <i>options</i>, int *<i>ovector</i>, int <i>ovecsize</i>);</b>
<br>
<br>
<b>int pcre16_exec(const pcre16 *<i>code</i>, const pcre16_extra *<i>extra</i>,</b>
<b>     PCRE_SPTR16 <i>subject</i>, int <i>length</i>, int <i>startoffset</i>,</b>
<b>     int <i>options</i>, int *<i>ovector</i>, int <i>ovecsize</i>);</b>
<br>
<br>
<b>int pcre32_exec(const pcre32 *<i>code</i>, const pcre32_extra *<i>extra</i>,</b>
<b>     PCRE_SPTR32 <i>subject</i>, int <i>length</i>, int <i>startoffset</i>,</b>
<b>     int <i>options</i>, int *<i>ovector</i>, int <i>ovecsize</i>);</b>
</P>
<br><b>
DESCRIPTION
</b><br>
<P>
This function matches a compiled regular expression against a given subject
string, using a matching algorithm that is similar to Perl's. It returns
offsets to captured substrings. Its arguments are:
<pre>
  <i>code</i>         Points to the compiled pattern
  <i>extra</i>        Points to an associated <b>pcre[16|32]_extra</b> structure,
                 or is NULL
  <i>subject</i>      Points to the subject string
  <i>length</i>       Length of the subject string
  <i>startoffset</i>  Offset in the subject at which to start matching
  <i>options</i>      Option bits
  <i>ovector</i>      Points to a vector of ints for result offsets
  <i>ovecsize</i>     Number of elements in the vector (a multiple of 3)
</pre>
The units for <i>length</i> and <i>startoffset</i> are bytes for
<b>pcre_exec()</b>, 16-bit data items for <b>pcre16_exec()</b>, and 32-bit items
for <b>pcre32_exec()</b>. The options are:
<pre>
  PCRE_ANCHORED          Match only at the first position
  PCRE_BSR_ANYCRLF       \R matches only CR, LF, or CRLF
  PCRE_BSR_UNICODE       \R matches all Unicode line endings
  PCRE_NEWLINE_ANY       Recognize any Unicode newline sequence
  PCRE_NEWLINE_ANYCRLF   Recognize CR, LF, & CRLF as newline sequences
  PCRE_NEWLINE_CR        Recognize CR as the only newline sequence
  PCRE_NEWLINE_CRLF      Recognize CRLF as the only newline sequence
  PCRE_NEWLINE_LF        Recognize LF as the only newline sequence
  PCRE_NOTBOL            Subject string is not the beginning of a line
  PCRE_NOTEOL            Subject string is not the end of a line
  PCRE_NOTEMPTY          An empty string is not a valid match
  PCRE_NOTEMPTY_ATSTART  An empty string at the start of the subject
                           is not a valid match
  PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations
  PCRE_NO_UTF16_CHECK    Do not check the subject for UTF-16
                           validity (only relevant if PCRE_UTF16
                           was set at compile time)
  PCRE_NO_UTF32_CHECK    Do not check the subject for UTF-32
                           validity (only relevant if PCRE_UTF32
                           was set at compile time)
  PCRE_NO_UTF8_CHECK     Do not check the subject for UTF-8
                           validity (only relevant if PCRE_UTF8
                           was set at compile time)
  PCRE_PARTIAL           ) Return PCRE_ERROR_PARTIAL for a partial
  PCRE_PARTIAL_SOFT      )   match if no full matches are found
  PCRE_PARTIAL_HARD      Return PCRE_ERROR_PARTIAL for a partial match
                           if that is found before a full match
</pre>
For details of partial matching, see the
<a href="pcrepartial.html"><b>pcrepartial</b></a>
page. A <b>pcre_extra</b> structure contains the following fields:
<pre>
  <i>flags</i>            Bits indicating which fields are set
  <i>study_data</i>       Opaque data from <b>pcre[16|32]_study()</b>
  <i>match_limit</i>      Limit on internal resource use
  <i>match_limit_recursion</i>  Limit on internal recursion depth
  <i>callout_data</i>     Opaque data passed back to callouts
  <i>tables</i>           Points to character tables or is NULL
  <i>mark</i>             For passing back a *MARK pointer
  <i>executable_jit</i>   Opaque data from JIT compilation
</pre>
The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT,
PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA,
PCRE_EXTRA_TABLES, PCRE_EXTRA_MARK and PCRE_EXTRA_EXECUTABLE_JIT.
</P>
<P>
There is a complete description of the PCRE native API in the
<a href="pcreapi.html"><b>pcreapi</b></a>
page and a description of the POSIX API in the
<a href="pcreposix.html"><b>pcreposix</b></a>
page.
<p>
Return to the <a href="index.html">PCRE index page</a>.
</p>

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