is it possible to delete old, unregistered shortcodes in the template

[shynkaruck]

for example, in the description I added the shortcode faq then deleted it well and, accordingly, the shortcode, but it is shown as a string. can add functionality to strip such tags?

[murdercode]

Does simply returning an empty string fit your needs?

class OldShortcode
{

    public function register($shortcode, $content, $compiler, $name, $viewData)
    {
        return '';
    }

}