SIZE_OP_FAIL_LOOK_BEHIND_NOT 1459 regcomp.c          len = SIZE_OP_PUSH_LOOK_BEHIND_NOT + tlen + SIZE_OP_FAIL_LOOK_BEHIND_NOT;
SIZE_OP_FAIL_LOOK_BEHIND_NOT 1546 regcomp.c      			   len + SIZE_OP_FAIL_LOOK_BEHIND_NOT);