void pcre_free_study(pcre_extra *extra);
void pcre16_free_study(pcre16_extra *extra);
This function is used to free the memory used for the data generated by a call to pcre_study() when it is no longer needed. The argument must be the result of such a call.
There is a complete description of the PCRE native API in the pcreapi page and a description of the POSIX API in the pcreposix page.