Since the system returns input unchanged if there is not any match, You need to use the item.ReferenceEquals method to ascertain whether or not the process has designed any replacements towards the input string.?�が?�詞?�し?�使?�れ?�場?�、物?�人?�元?�の位置?�状?�か?�新?�い?�の?�交?�さ?�る?�