ANCHOR_NOT_WORD_BOUND 1418 regcomp.c        case ANCHOR_NOT_WORD_BOUND: r = add_opcode(reg, OP_NOT_WORD_BOUND); break;
ANCHOR_NOT_WORD_BOUND 6226 regcomp.c          case ANCHOR_NOT_WORD_BOUND:  fputs("not word bound", f); break;
ANCHOR_NOT_WORD_BOUND 3255 regparse.c           tok->u.anchor = ANCHOR_NOT_WORD_BOUND;