Man page - pcre2_callout_enumerate(3)
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apt-get install libpcre2-dev
Manual
PCRE2_COMPILE
NAMESYNOPSIS
DESCRIPTION
NAME
PCRE2 - Perl-compatible regular expressions (revised API)
SYNOPSIS
#include <pcre2.h>
int
pcre2_callout_enumerate(const pcre2_code
*
code
,
int (*
callback
)(pcre2_callout_enumerate_block
*, void *),
void *
callout_data
);
DESCRIPTION
This function scans a compiled regular expression and calls the callback() function for each callout within the pattern. The yield of the function is zero for success and non-zero otherwise. The arguments are:
code
Points to the compiled pattern
callback
The callback function
callout_data
User data that is passed to the
callback
The callback() function is passed a pointer to a data block containing the following fields (not necessarily in this order):
uint32_t
version
Block version number
uint32_t
callout_number
Number for numbered callouts
PCRE2_SIZE
pattern_position
Offset to next item in
pattern
PCRE2_SIZE
next_item_length
Length of next item in
pattern
PCRE2_SIZE
callout_string_offset
Offset to string
within pattern
PCRE2_SIZE
callout_string_length
Length of callout
string
PCRE2_SPTR
callout_string
Points to callout string or
is NULL
The second argument passed to the callback() function is the callout data that was passed to pcre2_callout_enumerate() . The callback() function must return zero for success. Any other value causes the pattern scan to stop, with the value being passed back as the result of pcre2_callout_enumerate() .
There is a complete description of the PCRE2 native API in the pcre2api page and a description of the POSIX API in the pcre2posix page.