Проверка валидности email

- (BOOL) validateEmail: (NSString *) candidate
{
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:candidate];
}
Код взят из http://stackoverflow.com/questions/800123/best-practices-for -validating-email-address-in-objective-c-on-ios-2-0