Swift NSPredicate 评估失败

Question

我不熟悉使用 Regex 和 NSPredicates。我正在尝试将下面的 objective 代码转换为 swift 但失败并出现以下错误：

'NSInvalidArgumentException', reason: 'Can't do regex matching on object SELF MATCHES ".+@([A-Za-z0-9-]+\.)+[A-Za-z]{2}[A-Za-z]*".'

Objective C代码：

- (BOOL)validateEmailWithString:(NSString*)userEmail
{
    BOOL stricterFilter = NO;
    NSString *stricterFilterString = @"[A-Z0-9a-z\._%+-]+@([A-Za-z0-9-]+\.)+[A-Za-z]{2,4}";
    NSString *laxString = @".+@([A-Za-z0-9-]+\.)+[A-Za-z]{2}[A-Za-z]*";
    NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailTest evaluateWithObject:userEmail];
}

等价Swift代码

func validateEmail(withString userEmail: String) -> Bool {
        let stricterFilter: Bool = false
        let stricterFilterString: String = "[A-Z0-9a-z\._%+-]+@([A-Za-z0-9-]+\.)+[A-Za-z]{2,4}"
        let laxString: String = ".+@([A-Za-z0-9-]+\.)+[A-Za-z]{2}[A-Za-z]*"
        let emailRegex: String = stricterFilter ? stricterFilterString : laxString
        let emailTest = NSPredicate(format: "SELF MATCHES %@", emailRegex)
        return emailTest.evaluate(with: emailTest)
    }

异常发生在这一行：

return emailTest.evaluate(with: emailTest)

Objective C 代码工作正常，但在 swift 中应用程序崩溃。有人可以帮我解决这个问题吗？

Answer 1

请用这条线测试一下

let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}"

let emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
return emailTest.evaluateWithObject(userEmail)

Answer 2

试试这个

func validateEmailWithString(checkString : String) -> Bool {

    let emailFormat = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,64}"
    let emailPredicate = NSPredicate(format:"SELF MATCHES %@", emailFormat)
    return emailPredicate.evaluate(with: checkString)
}

Swift NSPredicate 评估失败

Swift NSPredicate evaluate fails

objective-c

nspredicate

ios

swift