I'm looking for a set of simple rules and redirects for my site. I've tried so many combinations that I'm starting to get confused.

I'm not sure how to set this up. Generally, without mod-rewrite, I would use relative paths to link to files:

<a href="link.php">Link</a>

if it's in the same directory.

Now I'd like to use this:

<a href="link">Link</a>

And so if you go to this page:

localhost/mysite/link

it will take you to the correct place, which would be:

localhost/mysite/link.php

But also, many directory levels deep I would like it to work as well:

localhost/mysite/group/link2

would go to:

localhost/mysite/group/link2.php

and:

localhost/mysite/group/section/link3

would go to:

localhost/mysite/group/section/link3.php

But then in all these cases, if someone were to type in this:

localhost/mysite/group/section/link3.php

in the URL bar, it would show this:

localhost/mysite/group/section/link3

Thanks