A non-regex way. This is overkill for one-offs but you can see it's actually quite terse and grows well. URI and Path::Class.

use URI;
use Path::Class;

my $uri = URI->new("http://192.162.143.201/nightly_results/2009_12_02/
+log_lcla114.ping.com_64.html");
my $path = Path::Class::File->new($uri->path);
print $path->basename, $/;
[download]