Correct Request URL syntax?

I’ve enjoyed using your Quick Redirects plugin, but I was struggling with one thing. What’s the correct syntax I should use in the Request URL to ensure the redirect works for all permutations of how the request URL could be typed in. For example, let’s say I want to have this URL: https://mydomain.com/source forward to https://mydomain.com/destination.

I’d like to ensure this works regardless of whether people type the following into the URL bar:

https://mydomain.com/source
https://mydomain.com/source
https://mydomain.com/source/
https://mydomain.com/source/
mydomain.com/source
mydomain.com/source/

How should I set up the request URL to ensure all 6 of these permutations are correctly redirected so people don’t end up getting 404 errors?

Thanks.