pcre2_serialize_free man page
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.
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.