NAME

       PCRE2 - Perl-compatible regular expressions (revised API)

SYNOPSIS

       #include <pcre2.h>

       int pcre2_substring_get_bynumber(pcre2_match_data *match_data,
         uint32_t number, PCRE2_UCHAR **bufferptr, PCRE2_SIZE *bufflen);

DESCRIPTION

       This  is  a  convenience function for extracting a captured substring by number into newly
       acquired memory. The arguments are:

         match_data    The match data for the match
         number        Number of the required substring
         bufferptr     Where to put the string pointer
         bufflen       Where to put the string length

       The memory in which the substring is  placed  is  obtained  by  calling  the  same  memory
       allocation  function  that  was  used  for  the match data block. The convenience function
       pcre2_substring_free() can be used to free it when it is no longer needed.  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_UNAVAILBLE    the ovector was too small for that group
         PCRE2_ERROR_UNSET         the group did not participate in the match
         PCRE2_ERROR_NOMEMORY      memory could not be obtained

       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.