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