【Xcode/Swift】ひらがな・カタカナ・英数字かどうかを判定するExtension

Extension

extension String {
    // ひらがなかどうか
    var isHiragana: Bool {
        let range = "^[ぁ-ゞ 　]+$"
        return NSPredicate(format: "SELF MATCHES %@", range).evaluate(with: self)
    }

    // カタカナかどうか
    var isKatakana: Bool {
        let range = "^[ァ-ヾ]+$"
        return NSPredicate(format: "SELF MATCHES %@", range).evaluate(with: self)
    }

    // 英数字かどうか
    var isAlphanumeric:Bool {
        let range = "[a-zA-Z0-9]+"
        return NSPredicate(format: "SELF MATCHES %@", range).evaluate(with: self)
    }
}