ONIGENC_STEP_BACK 2809 ext/mbstring/oniguruma/regexec.c       s = (UChar* )ONIGENC_STEP_BACK(encode, str, s, (int )tlen);
ONIGENC_STEP_BACK 2819 ext/mbstring/oniguruma/regexec.c       q = (UChar* )ONIGENC_STEP_BACK(encode, str, s, (int )tlen);
ONIGENC_STEP_BACK 3638 ext/mbstring/oniguruma/regexec.c       UChar* pre_end = ONIGENC_STEP_BACK(reg->enc, str, end, 1);