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<title>pcre2_callout_enumerate specification</title>
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<h1>pcre2_callout_enumerate man page</h1>
<p>
Return to the <a href="index.html">PCRE2 index page</a>.
</p>
<p>
This page is part of the PCRE2 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;pcre2.h&#62;</b>
</P>
<P>
<b>int pcre2_callout_enumerate(const pcre2_code *<i>code</i>,</b>
<b>  int (*<i>callback</i>)(pcre2_callout_enumerate_block *, void *),</b>
<b>  void *<i>callout_data</i>);</b>
</P>
<br><b>
DESCRIPTION
</b><br>
<P>
This function scans a compiled regular expression and calls the <i>callback()</i>
function for each callout within the pattern. The yield of the function is zero
for success and non-zero otherwise. The arguments are:
<pre>
  <i>code</i>           Points to the compiled pattern
  <i>callback</i>       The callback function
  <i>callout_data</i>   User data that is passed to the callback
</pre>
The <i>callback()</i> function is passed a pointer to a data block containing
the following fields (not necessarily in this order):
<pre>
  uint32_t   <i>version</i>                Block version number
  uint32_t   <i>callout_number</i>         Number for numbered callouts
  PCRE2_SIZE <i>pattern_position</i>       Offset to next item in pattern
  PCRE2_SIZE <i>next_item_length</i>       Length of next item in pattern
  PCRE2_SIZE <i>callout_string_offset</i>  Offset to string within pattern
  PCRE2_SIZE <i>callout_string_length</i>  Length of callout string
  PCRE2_SPTR <i>callout_string</i>         Points to callout string or is NULL
</pre>
The second argument passed to the <b>callback()</b> function is the callout data
that was passed to <b>pcre2_callout_enumerate()</b>. The <b>callback()</b>
function must return zero for success. Any other value causes the pattern scan
to stop, with the value being passed back as the result of
<b>pcre2_callout_enumerate()</b>.
</P>
<P>
There is a complete description of the PCRE2 native API in the
<a href="pcre2api.html"><b>pcre2api</b></a>
page and a description of the POSIX API in the
<a href="pcre2posix.html"><b>pcre2posix</b></a>
page.
<p>
Return to the <a href="index.html">PCRE2 index page</a>.
</p>