Because the system returns enter unchanged if there is absolutely no match, You can utilize the article.ReferenceEquals technique to find out if the process 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?�