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110 lines
4.7 KiB
110 lines
4.7 KiB
4 months ago
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<html>
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<head>
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<title>pcre2_pattern_info specification</title>
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</head>
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<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
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<h1>pcre2_pattern_info man page</h1>
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<p>
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Return to the <a href="index.html">PCRE2 index page</a>.
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</p>
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<p>
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This page is part of the PCRE2 HTML documentation. It was generated
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automatically from the original man page. If there is any nonsense in it,
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please consult the man page, in case the conversion went wrong.
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<br>
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<br><b>
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SYNOPSIS
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</b><br>
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<P>
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<b>#include <pcre2.h></b>
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</P>
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<P>
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<b>int pcre2_pattern_info(const pcre2_code *<i>code</i>, uint32_t <i>what</i>,</b>
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<b> void *<i>where</i>);</b>
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</P>
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<br><b>
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DESCRIPTION
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</b><br>
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<P>
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This function returns information about a compiled pattern. Its arguments are:
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<pre>
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<i>code</i> Pointer to a compiled regular expression pattern
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<i>what</i> What information is required
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<i>where</i> Where to put the information
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</pre>
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The recognized values for the <i>what</i> argument, and the information they
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request are as follows:
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<pre>
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PCRE2_INFO_ALLOPTIONS Final options after compiling
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PCRE2_INFO_ARGOPTIONS Options passed to <b>pcre2_compile()</b>
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PCRE2_INFO_BACKREFMAX Number of highest backreference
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PCRE2_INFO_BSR What \R matches:
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PCRE2_BSR_UNICODE: Unicode line endings
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PCRE2_BSR_ANYCRLF: CR, LF, or CRLF only
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PCRE2_INFO_CAPTURECOUNT Number of capturing subpatterns
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PCRE2_INFO_DEPTHLIMIT Backtracking depth limit if set, otherwise PCRE2_ERROR_UNSET
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PCRE2_INFO_EXTRAOPTIONS Extra options that were passed in the
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compile context
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PCRE2_INFO_FIRSTBITMAP Bitmap of first code units, or NULL
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PCRE2_INFO_FIRSTCODETYPE Type of start-of-match information
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0 nothing set
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1 first code unit is set
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2 start of string or after newline
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PCRE2_INFO_FIRSTCODEUNIT First code unit when type is 1
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PCRE2_INFO_FRAMESIZE Size of backtracking frame
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PCRE2_INFO_HASBACKSLASHC Return 1 if pattern contains \C
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PCRE2_INFO_HASCRORLF Return 1 if explicit CR or LF matches exist in the pattern
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PCRE2_INFO_HEAPLIMIT Heap memory limit if set, otherwise PCRE2_ERROR_UNSET
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PCRE2_INFO_JCHANGED Return 1 if (?J) or (?-J) was used
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PCRE2_INFO_JITSIZE Size of JIT compiled code, or 0
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PCRE2_INFO_LASTCODETYPE Type of must-be-present information
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0 nothing set
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1 code unit is set
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PCRE2_INFO_LASTCODEUNIT Last code unit when type is 1
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PCRE2_INFO_MATCHEMPTY 1 if the pattern can match an empty string, 0 otherwise
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PCRE2_INFO_MATCHLIMIT Match limit if set, otherwise PCRE2_ERROR_UNSET
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PCRE2_INFO_MAXLOOKBEHIND Length (in characters) of the longest lookbehind assertion
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PCRE2_INFO_MINLENGTH Lower bound length of matching strings
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PCRE2_INFO_NAMECOUNT Number of named subpatterns
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PCRE2_INFO_NAMEENTRYSIZE Size of name table entries
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PCRE2_INFO_NAMETABLE Pointer to name table
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PCRE2_CONFIG_NEWLINE Code for the newline sequence:
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PCRE2_NEWLINE_CR
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PCRE2_NEWLINE_LF
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PCRE2_NEWLINE_CRLF
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PCRE2_NEWLINE_ANY
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PCRE2_NEWLINE_ANYCRLF
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PCRE2_NEWLINE_NUL
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PCRE2_INFO_RECURSIONLIMIT Obsolete synonym for PCRE2_INFO_DEPTHLIMIT
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PCRE2_INFO_SIZE Size of compiled pattern
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</pre>
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If <i>where</i> is NULL, the function returns the amount of memory needed for
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the requested information, in bytes. Otherwise, the <i>where</i> argument must
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point to an unsigned 32-bit integer (uint32_t variable), except for the
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following <i>what</i> values, when it must point to a variable of the type
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shown:
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<pre>
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PCRE2_INFO_FIRSTBITMAP const uint8_t *
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PCRE2_INFO_JITSIZE size_t
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PCRE2_INFO_NAMETABLE PCRE2_SPTR
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PCRE2_INFO_SIZE size_t
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</pre>
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The yield of the function is zero on success or:
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<pre>
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PCRE2_ERROR_NULL the argument <i>code</i> is NULL
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PCRE2_ERROR_BADMAGIC the "magic number" was not found
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PCRE2_ERROR_BADOPTION the value of <i>what</i> is invalid
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PCRE2_ERROR_BADMODE the pattern was compiled in the wrong mode
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PCRE2_ERROR_UNSET the requested information is not set
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</PRE>
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</P>
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<P>
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There is a complete description of the PCRE2 native API in the
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<a href="pcre2api.html"><b>pcre2api</b></a>
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page and a description of the POSIX API in the
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<a href="pcre2posix.html"><b>pcre2posix</b></a>
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page.
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<p>
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Return to the <a href="index.html">PCRE2 index page</a>.
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</p>
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