ANCHOR_WORD_BEGIN 1420 ext/mbstring/oniguruma/regcomp.c   case ANCHOR_WORD_BEGIN:     r = add_opcode(reg, OP_WORD_BEGIN);     break;
ANCHOR_WORD_BEGIN 6170 ext/mbstring/oniguruma/regcomp.c     case ANCHOR_WORD_BEGIN:      fputs("word begin", f);     break;
ANCHOR_WORD_BEGIN 3261 ext/mbstring/oniguruma/regparse.c       tok->u.anchor = ANCHOR_WORD_BEGIN;