Routing question

[eluser]Unknown[/eluser]
I am about to start writing a new site that is bringing together several other sites under one roof. All of these sites are community sharing sites that will be using the same code but I want to keep them separate entities having URLs like:

www.site.com/index.php/community_site_name/class/function/anything/else

www.site.com/index.php/another_community_site_name/class/function/anything/else

I have read the routing help file but I'm not too sure how (or if) this is possible, and with the above URL pass the community_site_name to the controller so that I can then use it in the queries etc.

If anyone could advise. Also, if anyone has another suggestion to do this then I'm open to changing my approach.

Cheers,

Jamie