PCRE2 - Perl-compatible regular expressions (revised API) .rs #include <pcre2.h>

 PCRE2_SIZE pcre2_get_match_data_size(pcre2_match_data *match_data); 

. .rs This function returns the size, in bytes, of the match data block that is its argument.

There is a complete description of the PCRE2 native API in the HREF
pcre2api
page and a description of the POSIX API in the HREF
pcre2posix
page.