Validating email address without using RegexKitLite

ValidateEmail.m

+ (BOOL)validateEmail:(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];  
}