Problem

Hello all, I wrote a post on xwiki-users this morning, because someone told me there is where the questions about "how to" are supposed to go, but nobody answered (and I figured it out by myself, with the help of Sergiu) so I'll try my luck here, as I really need some help. In a velocity script I receive a request and I take the value with #set($input =$request.get("param")). My question is, how can I apply string transformations (i.e to lowercase, split the string etc) to this variable($input) in velocity? I looked everywhere but I guess I miss something. Please help! Thank you, Evelina Slatineanu