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<title>pcre2_callout_enumerate specification</title>
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<h1>pcre2_callout_enumerate man page</h1>
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<br><b>
SYNOPSIS
</b><br>
<P>
<b>#include <pcre2.h></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:
<pre>
<i>version</i> Block version number
<i>pattern_position</i> Offset to next item in pattern
<i>next_item_length</i> Length of next item in pattern
<i>callout_number</i> Number for numbered callouts
<i>callout_string_offset</i> Offset to string within pattern
<i>callout_string_length</i> Length of callout string
<i>callout_string</i> Points to callout string or is NULL
</pre>
The second argument 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>.
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