Because the method returns enter unchanged if there isn't any match, You should use the thing.ReferenceEquals system to find out whether or not the process has produced any replacements to the enter string.?�が?�詞?�し?�使?�れ?�場?�、物?�人?�元?�の位置?�状?�か?�新?�い?�の?�交?�さ?�る?�と?�