OP_NOT_WORD_BOUND 1492 regcomp.c          else                      r = add_opcode(reg, OP_NOT_WORD_BOUND);
OP_NOT_WORD_BOUND 6183 regcomp.c        { OP_NOT_WORD_BOUND,      "not-word-bound",  ARG_NON },
OP_NOT_WORD_BOUND 2293 regexec.c          CASE(OP_NOT_WORD_BOUND)  MOP_IN(OP_NOT_WORD_BOUND);