字符串的正则验证

1、验证字符串是否为电话号码

func isTelNumber() -> Bool {
        let mobile = "^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$"
        let CM = "(^1(3[4-9]|4[7]|5[0-27-9]|7[8]|8[2-478])\\d{8}$)|(^1705\\d{7}$)"
        let CU = "(^1(3[0-2]|4[5]|5[56]|7[6]|8[56])\\d{8}$)|(^1709\\d{7}$)"
        let CT = "(^1(33|53|77|8[019])\\d{8}$)|(^1700\\d{7}$)"
        
        let regextestmobile = NSPredicate(format: "SELF MATCHES %@",mobile)
        let regextestcm = NSPredicate(format: "SELF MATCHES %@",CM )
        let regextestcu = NSPredicate(format: "SELF MATCHES %@" ,CU)
        let regextestct = NSPredicate(format: "SELF MATCHES %@" ,CT)
        
        return ((regextestmobile.evaluate(with: self) == true)
                       || (regextestcm.evaluate(with: self) == true)
                         || (regextestct.evaluate(with: self) == true)
                        || (regextestcu.evaluate(with: self) == true))
  }