ANCHOR_WORD_BOUND 1417 regcomp.c        case ANCHOR_WORD_BOUND:     r = add_opcode(reg, OP_WORD_BOUND);     break;
ANCHOR_WORD_BOUND 6225 regcomp.c          case ANCHOR_WORD_BOUND:      fputs("word bound",     f); break;
ANCHOR_WORD_BOUND 3249 regparse.c           tok->u.anchor = ANCHOR_WORD_BOUND;