pcre2_serialize_free (3) - Linux Man Pages
pcre2_serialize_free: Perl-compatible regular expressions (revised API)
PCRE2 - Perl-compatible regular expressions (revised API)
void pcre2_serialize_free(uint8_t *bytes);
This function frees the memory that was obtained by pcre2_serialize_encode() to hold a serialized byte stream. The argument must point to such a byte stream or be NULL, in which case the function returns without doing anything.
There is a complete description of the PCRE2 native API in the pcre2api page and a description of the serialization functions in the pcre2serialize page.