ios ios - 10 months ago 82
Objective-C Question

Email validation on textField in iPhone sdk

In iPhone App How to Add Email validation on UITextField?

Please Help and Suggest

Thanks.

Rog Rog
Answer Source

Use NSPredicate and Regex:

- (BOOL)validateEmailWithString:(NSString*)email
{
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"; 
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex]; 
    return [emailTest evaluateWithObject:email];
}

For a bunch of emails separated by a comma:

- (NSMutableArray*)validateEmailWithString:(NSString*)emails
{
    NSMutableArray *validEmails = [[NSMutableArray alloc] init];
    NSArray *emailArray = [emails componentsSeparatedByString:@","];
    for (NSString *email in emailArray)
    {
        NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"; 
        NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex]; 
        if ([emailTest evaluateWithObject:email])
            [validEmails addObject:email];
    }
    return [validEmails autorelease];
}

Edited Answer: (It also validates extra dots )

- (BOOL)validateEmailWithString:(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];
    return [emailTest evaluateWithObject:checkString];
}