Retrieve controller namd and function name from url

[eluser]coldscooter[/eluser]
It's not the client uri or the url i'm after. It's a string of link into the CI site, so could be of various form. Example:

cisite.com/controller1/index
http://cisite.com/controller1/
/controller1/

From all these strings, i'd like to be able to determine controller name and method name.

For all 3 it should be 'controller1' and 'index'