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As the technique returns input unchanged if there isn't any match, you can use the Object.ReferenceEquals technique to find out whether or not the strategy has made any replacements on the enter string.?�が?�詞?�し?�使?�れ?�場?�、物?�人?�元?�の位置?�状?�か?�新?�い?�の?�交?�さ?�る?�と?��