Check if in input not url address Laravel - development

Check if in input not url address Laravel

I have 2 inputs with social accounts, I need get login this social accounts. I need deny write links in this inputs. How I can do it?

$this->validate($request, [
        'google_plus' => 'required|not:url',
        'twitter' => 'required|not:url',
    ]);

not:url not working..

Example: I need deny link: https://twitter.com/loginUser And allow only: loginUser

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