ONIG_OPTIMIZE_EXACT_IC 5302 regcomp.c      	reg->optimize = ONIG_OPTIMIZE_EXACT_IC;
ONIG_OPTIMIZE_EXACT_IC 5306 regcomp.c            reg->optimize = ONIG_OPTIMIZE_EXACT_IC;
ONIG_OPTIMIZE_EXACT_IC 3841 regexec.c        case ONIG_OPTIMIZE_EXACT_IC:
ONIG_OPTIMIZE_EXACT_IC 3965 regexec.c        case ONIG_OPTIMIZE_EXACT_IC: