iPhone TextField 郵箱驗證

NSString*emailRegE=@"[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?";

// 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];
}







來自：http://stackoverflow.com/questions/5428304/email-validation-on-textfield-in-iphone-sdk