#define REXEC_COPY_STR 1 /* Need to copy the string. */
#define REXEC_CHECKED 2 /* check_substr already checked. */
#define REXEC_SCREAM 4 /* use scream table. */
+#define REXEC_IGNOREPOS 8 /* \G matches at start. */
#define ReREFCNT_inc(re) ((re && re->refcnt++), re)
#define ReREFCNT_dec(re) pregfree(re)