Section (3) pcre2_match_data_free
PCRE2 — Perl-compatible regular expressions (revised API)
match_data is NULL, this
function does nothing. Otherwise,
match_data must point to a match data
block, which this function frees, using the memory freeing
function from the general context or compiled pattern with
which it was created, or
if that was not set.
If the PCRE2_COPY_MATCHED_SUBJECT was used for a successful match using this match data block, the copy of the subject that was remembered with the block is also freed.
This manual page is taken from the PCRE library, which is distributed under the BSD license.