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Since the method returns input unchanged if there is absolutely no match, You may use the Object.ReferenceEquals method to find out whether the process has manufactured 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?�