301 Redirect - only the root folder to another page

Hello community

I’m trying to do a 301 redirect on my website. My aim is to redirect only a certain folder to another page but not redirect if someone has entered a specific URL in that folder.

Let me clarify what I mean. I have a folder - toberedirected, I want everytime someone opens https://www.mydomain.com/toberedirected to be redirected to https://www.mydomain.com/placetoredirect.php however if someone opens https://www.mydomain.com/toberedirected/something.php not to be redirected.

For some reason, I’ve not been able to make it work. Nothing actually happens