homepage regexp matching

I'm trying to write a regexp which allow me to filter out all the url addresses having this shape.

http://foo.com/
http://foo
http://foo.*

But not the following:

http://foo.com/subfoo
http://foo.com/subfoo/
http://foo.com/subfoo/subsubfoo..

In order to match the second url group i've written the following regexp:

http://.*/.

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However my problem is search the regexp matching the first group. So i need a way to say:

if after http://.* or http.//.*/ there is nothing, matches the pattern.

I've read something on lookhaead. I don't know it this might be the right way. Any idea? Thanks for your answer.

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A bit late, but this worked for me:

http://[^/]*[/]*$

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/^http:\/\/[^/?#]*\/./i

should match only http URLs with a path component other than /.

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Don't forget query strings like this: http://foo.com/?search

/^http:\/\/[^/?#]*\/[^?]/i