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<title>pcre2_pattern_info specification</title>
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<h1>pcre2_pattern_info man page</h1>
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<br><b>
SYNOPSIS
</b><br>
<P>
<b>#include <pcre2.h></b>
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<P>
<b>int pcre2_pattern_info(const pcre2 *<i>code</i>, uint32_t <i>what</i>, void *<i>where</i>);</b>
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<br><b>
DESCRIPTION
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This function returns information about a compiled pattern. Its arguments are:
<pre>
<i>code</i> Pointer to a compiled regular expression
<i>what</i> What information is required
<i>where</i> Where to put the information
</pre>
The recognized values for the <i>what</i> argument, and the information they
request are as follows:
<pre>
PCRE2_INFO_ALLOPTIONS Final options after compiling
PCRE2_INFO_ARGOPTIONS Options passed to <b>pcre2_compile()</b>
PCRE2_INFO_BACKREFMAX Number of highest back reference
PCRE2_INFO_BSR What \R matches:
PCRE2_BSR_UNICODE: Unicode line endings
PCRE2_BSR_ANYCRLF: CR, LF, or CRLF only
PCRE2_INFO_CAPTURECOUNT Number of capturing subpatterns
PCRE2_INFO_FIRSTBITMAP Bitmap of first code units, or NULL
PCRE2_INFO_FIRSTCODETYPE Type of start-of-match information
0 nothing set
1 first code unit is set
2 start of string or after newline
PCRE2_INFO_FIRSTCODEUNIT First code unit when type is 1
PCRE2_INFO_HASBACKSLASHC Return 1 if pattern contains \C
PCRE2_INFO_HASCRORLF Return 1 if explicit CR or LF matches
exist in the pattern
PCRE2_INFO_JCHANGED Return 1 if (?J) or (?-J) was used
PCRE2_INFO_JITSIZE Size of JIT compiled code, or 0
PCRE2_INFO_LASTCODETYPE Type of must-be-present information
0 nothing set
1 code unit is set
PCRE2_INFO_LASTCODEUNIT Last code unit when type is 1
PCRE2_INFO_MATCHEMPTY 1 if the pattern can match an
empty string, 0 otherwise
PCRE2_INFO_MATCHLIMIT Match limit if set,
otherwise PCRE2_ERROR_UNSET
PCRE2_INFO_MAXLOOKBEHIND Length (in characters) of the longest
lookbehind assertion
PCRE2_INFO_MINLENGTH Lower bound length of matching strings
PCRE2_INFO_NAMECOUNT Number of named subpatterns
PCRE2_INFO_NAMEENTRYSIZE Size of name table entries
PCRE2_INFO_NAMETABLE Pointer to name table
PCRE2_CONFIG_NEWLINE Code for the newline sequence:
PCRE2_NEWLINE_CR
PCRE2_NEWLINE_LF
PCRE2_NEWLINE_CRLF
PCRE2_NEWLINE_ANY
PCRE2_NEWLINE_ANYCRLF
PCRE2_INFO_RECURSIONLIMIT Recursion limit if set,
otherwise PCRE2_ERROR_UNSET
PCRE2_INFO_SIZE Size of compiled pattern
</pre>
If <i>where</i> is NULL, the function returns the amount of memory needed for
the requested information, in bytes. Otherwise, the <i>where</i> argument must
point to an unsigned 32-bit integer (uint32_t variable), except for the
following <i>what</i> values, when it must point to a variable of the type
shown:
<pre>
PCRE2_INFO_FIRSTBITMAP const uint8_t *
PCRE2_INFO_JITSIZE size_t
PCRE2_INFO_NAMETABLE PCRE2_SPTR
PCRE2_INFO_SIZE size_t
</pre>
The yield of the function is zero on success or:
<pre>
PCRE2_ERROR_NULL the argument <i>code</i> is NULL
PCRE2_ERROR_BADMAGIC the "magic number" was not found
PCRE2_ERROR_BADOPTION the value of <i>what</i> is invalid
PCRE2_ERROR_BADMODE the pattern was compiled in the wrong mode
PCRE2_ERROR_UNSET the requested information is not set
</PRE>
</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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