How to “inverse match” with regex without content? : <p>I have read <a href="https://stackoverflow.com/questions/164414/how-to-inverse-match-with-regex">How to &quot;inverse match&quot; with regex?</a> and i would like to know if i can apply it to a non-content regex. In particular i'm talking about: <code>^[A-z0-9+\/]{44}$</code></p>

<p>I tried <a href="https://regex101.com/r/NmOs7Z/1" rel="nofollow noreferrer">https://regex101.com/r/NmOs7Z/1</a> but it does not work</p>
