swift 常用的正则表达式，校验方式

//MARK: - 验证是否是纯数字

    func isNumber() -> Bool {

        let pattern = "^[0-9]+$"

        if NSPredicate(format: "SELF MATCHES %@", pattern).evaluate(with: self) {

            return true

        }

        return false

    }

    

    // 验证是不是字母

    func isLetter() -> Bool {

        let pattern = "^^[A-Za-z0-9]+$"

        if NSPredicate(format: "SELF MATCHES %@", pattern).evaluate(with: self) {

            return true

        }

        return false

    }

    

    //MARK: - 验证是否是6位纯数字

    func isNumberSix() -> Bool {

        let pattern = "^\\d{6}$"

        if NSPredicate(format: "SELF MATCHES %@", pattern).evaluate(with: self) {

            return true

        }

//        let a = "aaaa"

//        a.trimOptional()

        return false

    }

    //MARK: - 验证是否是是有效提现金额

    func verifyNumberTwo() -> Bool {

        let pattern = "^\\d+(\\.\\d{1,2})?$"

        if NSPredicate(format: "SELF MATCHES %@", pattern).evaluate(with: self) {

            return true

        }

        return false

    }

//检测银行卡

    func verifyBankCard() -> Bool {

        let pattern = "^([0-9]{16}|[0-9]{19}|[0-9]{17}|[0-9]{18}|[0-9]{20}|[0-9]{21})$"

        let regex = try! NSRegularExpression(pattern: pattern, options: NSRegularExpression.Options.dotMatchesLineSeparators)

        if let _ = regex.firstMatch(in: self, options: NSRegularExpression.MatchingOptions(rawValue: 0), range: NSMakeRange(0, self.characters.count)) {

            return true

        }

        return false

    }

    //检测姓名

    func verifyUserName() -> Bool {

        let pattern = "(^[\u{4e00}-\u{9fa5}]{2,12}$)|(^[A-Za-z0-9_-]{4,12}$)"

        let regex = try! NSRegularExpression(pattern: pattern, options: NSRegularExpression.Options.dotMatchesLineSeparators)

        if let _ = regex.firstMatch(in: self, options: NSRegularExpression.MatchingOptions(rawValue: 0), range: NSMakeRange(0, self.characters.count)) {

            return true

        }

        return false

    }

    //MARK: - 验证身份证

    func verifyId() -> Bool {

        let pattern = "(^[0-9]{15}$)|([0-9]{17}([0-9]|X)$)"

        let regex = try! NSRegularExpression(pattern: pattern, options: NSRegularExpression.Options.dotMatchesLineSeparators)

        if let _ = regex.firstMatch(in: self, options: NSRegularExpression.MatchingOptions(rawValue: 0), range: NSMakeRange(0, self.characters.count)) {

            return true

        }

        return false

    }

    //MARK:处理手机号

    func phoneNoAddAsterisk() -> String {

        return (self as NSString).replacingCharacters(in: NSMakeRange(3,4), with: "****")

    }

    

    //MARK:处理手机号

    func phoneNoHide() -> String {

        return (self as NSString).replacingCharacters(in: NSMakeRange(2,7), with: "*******")

    }

    //MARK:处理银行卡号(隐藏几位)

    func bankCardAddAsterisk() -> String {

        if self.characters.count  == 0 {

            return self

        }

        return (self as NSString).replacingCharacters(in: NSMakeRange(4,10), with: "***********")

    }

    //MARK:获取字符串个数(去空格)

    func trim() -> String {

        return self.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)

    }

    // 检测密码

    func isPassword() -> Bool {

        let pattern = "^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z]{6,18}$"//"^[@A-Za-z0-9!#\\$%\\^&*\\.~_]{6,20}$"

        let regex = try! NSRegularExpression(pattern: pattern, options: NSRegularExpression.Options.dotMatchesLineSeparators)

        if let _ = regex.firstMatch(in: self, options: NSRegularExpression.MatchingOptions(rawValue: 0), range: NSMakeRange(0, self.characters.count)) {

            return true

        }

        return false

    }

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