ios - 无法进行正则表达式匹配，原因：无法打开模式

Question

textField在我之后输入“asdf”时收到此错误消息endEditing：

由于未捕获的异常'NSInternalInconsistencyException'而终止应用程序，原因：'无法进行正则表达式匹配，原因：无法打开模式U_REGEX_MISMATCHED_PAREN（字符串asdf，模式^（？=。[AZ]。（？=。 [0-9 ].(?=.*[az].{8}$, case 0, canon 0)'

static func isPasswordValid(_ password : String) -> Bool {

    /*
    ^                         Start anchor
    (?=.*[A-Z].*[A-Z])        Ensure string has two uppercase letters.
    (?=.*[!@#$&*])            Ensure string has one special case letter.
    (?=.*[0-9].*[0-9])        Ensure string has two digits.
    (?=.*[a-z].*[a-z].*[a-z]) Ensure string has three lowercase letters.
    .{8}                      Ensure string is of length 8.
    $                         End anchor.
    */

    let passwordTest = NSPredicate(format: "SELF MATCHES %@", "^(?=.*[A-Z].(?=.*[0-9].(?=.*[a-z].{8}$")
    return passwordTest.evaluate(with: password)
}

我这样称呼它：

    func textFieldShouldEndEditing(_ textField: UITextField) -> Bool {

       if textField == passwordTextField {
        if !Utilities.isPasswordValid(textField.text!){
            self.passwordTextField.borderInactiveColor = .red
            print("hi")
        }
       }
       return true
   }

我该如何摆脱这个？有什么错别字吗？我不明白，我很感激每一个帮助:)

标签： iosswiftregexuitextfield