-extern pcrs_job *pcrs_make_job(char *command, int *errptr);
-extern pcrs_job *create_pcrs_job(pcre *pattern, pcre_extra *hints, int options, int globalflag, pcrs_substitute *substitute, int *errptr);
-extern int pcrs_exec_substitution(pcrs_job *job, char *subject, int subject_length, char **result, int *result_length);