Since the technique returns enter unchanged if there's no match, you can use the item.ReferenceEquals approach to ascertain whether the method has created any replacements on the input string.?�が?�詞?�し?�使?�れ?�場?�、物?�人?�元?�の位置?�状?�か?�新?�い?�の?�交?�さ?�る?�と?�示?�。�