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<h1>pcre2_pattern_info man page</h1>

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This page is part of the PCRE2 HTML documentation. It was generated
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SYNOPSIS
 

#include &#60;pcre2.h&#62;


int pcre2_pattern_info(const pcre2 *code, uint32_t what, void *where);

 
DESCRIPTION
 

This function returns information about a compiled pattern. Its arguments are:
<pre>
 code Pointer to a compiled regular expression pattern
 what What information is required
 where Where to put the information
</pre>
The recognized values for the what argument, and the information they
request are as follows:
<pre>
 PCRE2_INFO_ALLOPTIONS Final options after compiling
 PCRE2_INFO_ARGOPTIONS Options passed to pcre2_compile()
 PCRE2_INFO_BACKREFMAX Number of highest backreference
 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_DEPTHLIMIT Backtracking depth limit if set, otherwise PCRE2_ERROR_UNSET
 PCRE2_INFO_EXTRAOPTIONS Extra options that were passed in the
 compile context
 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_FRAMESIZE Size of backtracking frame
 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_HEAPLIMIT Heap memory limit if set, otherwise PCRE2_ERROR_UNSET
 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_NEWLINE_NUL
 PCRE2_INFO_RECURSIONLIMIT Obsolete synonym for PCRE2_INFO_DEPTHLIMIT
 PCRE2_INFO_SIZE Size of compiled pattern
</pre>
If where is NULL, the function returns the amount of memory needed for
the requested information, in bytes. Otherwise, the where argument must
point to an unsigned 32-bit integer (uint32_t variable), except for the
following what 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 code is NULL
 PCRE2_ERROR_BADMAGIC the "magic number" was not found
 PCRE2_ERROR_BADOPTION the value of what is invalid
 PCRE2_ERROR_BADMODE the pattern was compiled in the wrong mode
 PCRE2_ERROR_UNSET the requested information is not set
</PRE>


There is a complete description of the PCRE2 native API in the
<a href="pcre2api.html">pcre2api</a>
page and a description of the POSIX API in the
<a href="pcre2posix.html">pcre2posix</a>
page.

Return to the <a href="index.html">PCRE2 index page</a>.

MR SKB