File::Basename works just fine for URLs are well as real filenames: 
use File::Basename;

print basename 'http://www.plenty.org/downloads/crap.exe';

[download]
Update: This does break if the url is something like http://www.plenty.org/downloads/crap.exe?foo=/path/to/something. But so do the others example, I believe.

In reply to Re: Get the filename from the end of a URL by mr.nick
in thread Get the filename from the end of a URL by ip9

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