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Swiftで正規表現を使って文字列を置換する

String.replacingOccurrencesのオプションに.regularExpressionを指定します。また、後方参照は\1{1}でなく$1です。以下、twitterのプロフィール画像URLを置換する例です。

extension String {
    func twttrPhoto() -> String {
        return replacingOccurrences(
            of: "^https?://(.+)_normal(.+)$",
            with: "https://$1$2",
            options: .regularExpression,
            range: self.range(of: self))
    }
}
let url = "http://pbs.twimg.com/profile_images/1610656772/nTotani_normal.jpg"

url.twttrPhoto()
// => https://pbs.twimg.com/profile_images/1610656772/nTotani.jpg

先頭がhttpsになり、_normalが取り除かれています。

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