parm1,http://*.google.com*/*,parm3
parm1,http://*.google.com*/*,parm3
parm1,http://*.yahoo.com*/*,parm3
parm1,http://*.google.com*/*,parm3
parm1,http://*.gmail.com*/*,parm3
parm1,http://*.yahoo.com*/*,parm3
parm1,http://*.google.com*/*,parm3

##</code><code>##

  if (grep {$time_url_hits->[$i]->{url}} @url_list){
#print "found \n";
}
else {
    print "adding url " . $time_url_hits->[$i]->{'url'} . " to url array \n";
    push (@url_list,$time_url_hits->[$i]->{'url'});
...
<other processing>
...
<then later>
foreach (@url_list) {
<do stuff for each unique filter string>