pcre2/doc/pcre2_pattern_info.3

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.TH PCRE2_PATTERN_INFO 3 "21 October 2014" "PCRE2 10.00"
.SH NAME
PCRE2 - Perl-compatible regular expressions (revised API)
.SH SYNOPSIS
.rs
.sp
.B #include <pcre2.h>
.PP
.nf
.B int pcre2_pattern_info(const pcre2 *\fIcode\fP, uint32_t \fIwhat\fP, void *\fIwhere\fP);
.fi
.
.SH DESCRIPTION
.rs
.sp
This function returns information about a compiled pattern. Its arguments are:
.sp
\fIcode\fP Compiled regular expression
\fIwhat\fP What information is required
\fIwhere\fP Where to put the information
.sp
If \fIwhere\fP is NULL, the function returns the amount of memory needed for
the requested information, in bytes. The following information is available:
.sp
PCRE2_INFO_ALLOPTIONS Final options after compiling
PCRE2_INFO_ARGOPTIONS Options passed to \fBpcre2_compile()\fP
PCRE2_INFO_BACKREFMAX Number of highest back reference
PCRE2_INFO_BSR What \eR matches
0 all Unicode line endings
1 CR, LF, or CRLF only
PCRE2_INFO_CAPTURECOUNT Number of capturing subpatterns
PCRE2_INFO_FIRSTBITMAP Bitmap of first code units, or NULL
PCRE2_INFO_FIRSTCODEUNIT First code unit when type is 1
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_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_LASTCODEUNIT Last code unit when type is 1
PCRE2_INFO_LASTCODETYPE Type of must-be-present information
0 nothing set
1 code unit is set
PCRE2_INFO_MATCHEMPTY 1 if the pattern can match an
empty string, 0 otherwise
PCRE2_INFO_MATCHLIMIT Match limit if set,
otherwise PCRE2_RROR_UNSET
PCRE2_INFO_MAXLOOKBEHIND Length (in characters) of the longest
lookbehind assertion
PCRE2_INFO_MINLENGTH Lower bound length of matching strings
PCRE2_INFO_NAMEENTRYSIZE Size of name table entries
PCRE2_INFO_NAMECOUNT Number of named subpatterns
PCRE2_INFO_NAMETABLE Pointer to name table
PCRE2_CONFIG_NEWLINE Code for the newline sequence:
1 for CR
2 for LF
3 for CRLF
4 for ANY
5 for ANYCRLF
PCRE2_INFO_RECURSIONLIMIT Recursion limit if set,
otherwise PCRE2_ERROR_UNSET
PCRE2_INFO_SIZE Size of compiled pattern
.sp
The \fIwhere\fP argument must point to an unsigned 32-bit integer (uint32_t
variable), except for the following \fIwhat\fP values:
.sp
PCRE2_INFO_FIRSTBITMAP const uint8_t
PCRE2_INFO_JITSIZE size_t
PCRE2_INFO_NAMETABLE PCRE2_SPTR
PCRE2_INFO_SIZE size_t
.sp
The yield of the function is zero on success or:
.sp
PCRE2_ERROR_NULL the argument \fIcode\fP is NULL
PCRE2_ERROR_BADMAGIC the "magic number" was not found
PCRE2_ERROR_BADOPTION the value of \fIwhat\fP is invalid
PCRE2_ERROR_BADMODE the pattern was compiled in the wrong mode
PCRE2_ERROR_UNSET the requested information is not set
.P
There is a complete description of the PCRE2 native API in the
.\" HREF
\fBpcre2api\fP
.\"
page and a description of the POSIX API in the
.\" HREF
\fBpcre2posix\fP
.\"
page.