判斷字符串是否是手機號或者郵編

iOS中對string類的擴展，判斷字符串是否是手機號；

extension  String {

     func isPhoneNumber() -> bool {

      let pattern = "^1[3456789]\\d{9}$"  

   return NSPredicate.init(format:"SELF MATCHES %@",pattern).evaluateWithObject(self)

  }

 /// 判斷是否是郵政編碼

    func isPostCode() -> Bool {

        let pattern = "^\\d{6}$"

        return NSPredicate.init(format:"SELF MATCHES %@",pattern).evaluateWithObject(self)

    }

}