use strict;
use warnings;

my $mystring = "http://192.162.143.201/nightly_results/2009_12_02/log_
+lcla114.ping.com_64.html";
if($mystring=~/(.*)\/(.*)/)
{
    print "File Name : $2";
}
[download]

Output
File Name : log_lcla114.ping.com_64.html