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108 lines
4.4 KiB
108 lines
4.4 KiB
.TH PCRE2_PATTERN_INFO 3 "14 February 2019" "PCRE2 10.33"
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.SH NAME
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PCRE2 - Perl-compatible regular expressions (revised API)
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.SH SYNOPSIS
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.rs
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.sp
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.B #include <pcre2.h>
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.PP
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.nf
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.B int pcre2_pattern_info(const pcre2_code *\fIcode\fP, uint32_t \fIwhat\fP,
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.B " void *\fIwhere\fP);"
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.fi
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.
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.SH DESCRIPTION
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.rs
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.sp
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This function returns information about a compiled pattern. Its arguments are:
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.sp
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\fIcode\fP Pointer to a compiled regular expression pattern
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\fIwhat\fP What information is required
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\fIwhere\fP Where to put the information
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.sp
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The recognized values for the \fIwhat\fP argument, and the information they
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request are as follows:
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.sp
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PCRE2_INFO_ALLOPTIONS Final options after compiling
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PCRE2_INFO_ARGOPTIONS Options passed to \fBpcre2_compile()\fP
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PCRE2_INFO_BACKREFMAX Number of highest backreference
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PCRE2_INFO_BSR What \eR 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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.\" JOIN
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PCRE2_INFO_DEPTHLIMIT Backtracking depth limit if set,
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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 \eC
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.\" JOIN
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PCRE2_INFO_HASCRORLF Return 1 if explicit CR or LF matches
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exist in the pattern
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.\" JOIN
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PCRE2_INFO_HEAPLIMIT Heap memory limit if set,
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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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.\" JOIN
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PCRE2_INFO_MATCHEMPTY 1 if the pattern can match an
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empty string, 0 otherwise
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.\" JOIN
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PCRE2_INFO_MATCHLIMIT Match limit if set,
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otherwise PCRE2_ERROR_UNSET
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.\" JOIN
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PCRE2_INFO_MAXLOOKBEHIND Length (in characters) of the longest
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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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.sp
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If \fIwhere\fP is NULL, the function returns the amount of memory needed for
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the requested information, in bytes. Otherwise, the \fIwhere\fP argument must
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point to an unsigned 32-bit integer (uint32_t variable), except for the
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following \fIwhat\fP values, when it must point to a variable of the type
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shown:
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.sp
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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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.sp
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The yield of the function is zero on success or:
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.sp
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PCRE2_ERROR_NULL the argument \fIcode\fP 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 \fIwhat\fP 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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.P
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There is a complete description of the PCRE2 native API in the
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.\" HREF
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\fBpcre2api\fP
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.\"
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page and a description of the POSIX API in the
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.\" HREF
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\fBpcre2posix\fP
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.\"
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page.
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