ONIG_META_CHAR_ESCAPE  217 ext/mbstring/oniguruma/onigcmpt200.h #define REG_META_CHAR_ESCAPE            ONIG_META_CHAR_ESCAPE
ONIG_META_CHAR_ESCAPE  212 ext/mbstring/oniguruma/regsyntax.c   case ONIG_META_CHAR_ESCAPE: