Synopsis

#include <pcre2.h>

int pcre2_substring_copy_bynumber(pcre2_match_data *match_data,
                                  uint32_t stringnumber,
                                  PCRE2_UCHAR *buffer,
                                  PCRE2_SIZE *sizeptr);

Description

This is a convenience function for extracting a captured substring into a given buffer. The arguments are:

match_data

The match data block for the match

stringnumber

Number of the required substring

buffer

Buffer to receive the string

sizeptr

Length of buffer

The sizeptr variable is updated with the length of the extracted string, excluding the terminating zero. The yield of the function is zero for success or one of the following error numbers:

PCRE2_ERROR_NOSUBSTRING

there are no groups of that number

PCRE2_ERROR_UNAVAILABLE

the ovector was too small for that group

PCRE2_ERROR_UNSET

the group did not participate in the match

PCRE2_ERROR_NOMEMORY

the buffer is too small

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.