1 -(BOOL)isValidateEmail:(NSString *)email2 {3     NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+//.[A-Za-z]{2,4}";4     NSPRedicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];5     return [emailTest evaluateWithObject:email];6 }