bitset_is_empty 570 mbstring/oniguruma/regcomp.c if (ONIGENC_MBC_MINLEN(reg->enc) > 1 || bitset_is_empty(cc->bs)) { bitset_is_empty 606 mbstring/oniguruma/regcomp.c if (ONIGENC_MBC_MINLEN(reg->enc) > 1 || bitset_is_empty(cc->bs)) {