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<title>pcre2_pattern_info specification</title>
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<h1>pcre2_pattern_info man page</h1>
<p>
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<p>
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<br>
<br><b>
SYNOPSIS
</b><br>
<P>
<b>#include &#60;pcre2.h&#62;</b>
</P>
<P>
<b>int pcre2_pattern_info(const pcre2 *<i>code</i>, uint32_t <i>what</i>, void *<i>where</i>);</b>
</P>
<br><b>
DESCRIPTION
</b><br>
<P>
This function returns information about a compiled pattern. Its arguments are:
<pre>
  <i>code</i>     Pointer to a compiled regular expression pattern
  <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 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 <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>.
</p>
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