Email and URL Validation in Objective-C

Use this Code for Email Validation:

- (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:txtEmail.text];

}

Use this Code for URL Validation:

- (BOOL) validateUrl: (NSString *) candidate {

    NSString *urlRegEx =@"(http|https)://((\\w)*|([0-9]*)|([-|_])*)+([\\.|/]((\\w)*|([0-9]*)|([-|_])*))+";
    NSPredicate *urlTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", urlRegEx];

    return [urlTest evaluateWithObject:txtUrl.text];

}