pcre2_serialize_decode man page
PCRE2 — Perl-compatible regular expressions (revised API)
int32_t pcre2_serialize_decode(pcre2_code **codes, int32_t number_of_codes, const uint8_t *bytes, pcre2_general_context *gcontext);
This function decodes a serialized set of compiled patterns back into a list of individual patterns. Its arguments are:
codes pointer to a vector in which to build the list
number_of_codes number of slots in the vector
bytes the serialized byte stream
gcontext pointer to a general context or NULL
The bytes argument must point to a block of data that was originally created by pcre2_serialize_encode(), though it may have been saved on disc or elsewhere in the meantime. If there are more codes in the serialized data than slots in the list, only those compiled patterns that will fit are decoded. The yield of the function is the number of decoded patterns, or one of the following negative error codes:
PCRE2_ERROR_BADDATA number_of_codes is zero or less
PCRE2_ERROR_BADMAGIC mismatch of id bytes in bytes
PCRE2_ERROR_BADMODE mismatch of variable unit size or PCRE version
PCRE2_ERROR_MEMORY memory allocation failed
PCRE2_ERROR_NULL codes or bytes is NULL
PCRE2_ERROR_BADMAGIC may mean that the data is corrupt, or that it was compiled on a system with different endianness.
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.