void pcre2_code_free(pcre2_code *code);
If code is NULL, this function does nothing. Otherwise, code must point to a compiled pattern. This function frees its memory, including any memory used by the JIT compiler. If the compiled pattern was created by a call to pcre2_code_copy_with_tables(), the memory for the character tables is also freed.
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.