NAME

       PCRE2 - Perl-compatible regular expressions (revised API)

SYNOPSIS

       #include <pcre2.h>

       int pcre2_substring_length_bynumber(pcre2_match_data *match_data,
         uint32_t number, PCRE2_SIZE *length);

DESCRIPTION

       This  function  returns  the  length  of  a  matched substring, identified by number.  The
       arguments are:

         match_data   The match data block for the match
         number       The substring number
         length       Where to return the length, or NULL

       The third argument may be NULL if all you want to know is whether or not  a  substring  is
       set.  The  yield  is  zero on success, or a negative error code otherwise. After a partial
       match, only substring 0 is available.

       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.