Do you have the complete URI in a single string or do you have it in a text? The first is quite simple:

($file) = $uri =~ /^.*\/(.*)$/;
[download]

You might end up with an empty $file if the URI ends in a / (and therefore uses the default index file).

The later is more complicate, for you have to keep different things in mind:

• You should change the class of allowed characters to something more strict, to just the allowed characters that are defined in the URI RFC.
• On the other hand people tend to put allowed URI-characters behind their URIs. Usual character in that range include the dot (`.'), closing brackets (`)') and coma (`,'). Also quotation marks fall in that range. So you should add a 1-character wide character class at the end that doesn't include those, too.

There might be other things that I haven't thought about yet, but I hope you get the image...
--
Alfie

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