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String.prototype.replaceAll

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既存のString.prototype.replace()では、正規表現の/gオプションを使わなければ、マッチした始めの1単語しか変換されませんでした。

    "ippai".replace("i", "o")
    // => "oppai"
    "ippai".replace(/i/g, "o")
    // => "oppao"

ES2021で追加されたString.prototype.replaceAll()を使えば、正規表現を使わなくてもマッチしたすべての単語を変換することができます。

    "ippai".replaceAll("i", "o")
    // => "oppao"
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