Question

我想验证iOS中的电子邮件。我已经编写了一个类别类，这里是我的代码，但在某些情况下，例如 abc@gmail.com.com 它没有工作......

如果用户连续两次输入.com或.in，则表示没有检测到它......

我尝试了一些解决方案，但也没有用。这就是我在这里问的原因

- (BOOL)isValidEmail {
   NSString *emailString = [self stringByTrimmingCharactersInSet:   [NSCharacterSet whitespaceAndNewlineCharacterSet]];

   BOOL isValid = YES;
   BOOL sticterFilter = YES;

   NSString *stricterFilterString = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
   NSString *laxString = @".+@.+\\.[A-Za-z]{2}[A-Za-z]*";

   NSString *emailRegex = sticterFilter ? stricterFilterString : laxString;
   NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];

   if (![emailTest evaluateWithObject:emailString]) {
      isValid = NO;
   }

   return isValid;

}

Answer 1

检查一下。

-(BOOL) isValidEmail:(NSString *)email
    {
       BOOL filter = NO; 
       NSString *stricterString = @"^[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 = filter ? stricterString : laxString;
       NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
       return [emailTest evaluateWithObject:email];
    }

Answer 2

这个正则表达式可以正常工作：

- (void) checkMail{
   NSString *emailRegex = @"^[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,}$";
   NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
   if (self.mail.text.length <= 0) {
    //error empty
}else if(![emailTest evaluateWithObject:self.mail.text]){
    //error address inserted...
}else{
    //correct email!
};

}

Answer 3

请检查以下答案。它可能对你有帮助。

-(BOOL) NSStringIsValidEmail:(NSString *)checkString
    {
        BOOL stricterFilter = NO; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/
        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];

        NSArray *firstArray = [checkString componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"@"]];
        NSString *input = [firstArray objectAtIndex:1];

        NSSet *aSet = [NSSet setWithArray:[input componentsSeparatedByString:@"."]];
        NSString *result = [aSet.allObjects componentsJoinedByString:@"."];

        if ([input isEqualToString:result]) {
            BOOL checkValue = [emailTest evaluateWithObject:checkString];
            return checkValue;
        }else{

            return FALSE;
        }


    }

Answer 4

以下功能对我来说就像一个魅力：

func validateEmailWithString(email: String) -> Bool {
    let emailRegex: String = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"
    let emailTest: NSPredicate = NSPredicate(format: "SELF MATCHES %@", emailRegex)
    return emailTest.evaluateWithObject(email)
}

Answer 5

尝试

if (![self validateEmailWithString:txtEmail.text])

{
//@"Please Enter a Valid Email Address"];
}




- (BOOL)validateEmailWithString:(NSString*)checkString
{
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:checkString];
}

电子邮件验证在iOS中的某些测试用例中无效

5 个答案: