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parm1,http://*.google.com*/*,parm3 parm1,http://*.google.com*/*,parm3 ... parm1,http://*.gmail.com*/*,parm3 parm1,http://*.yahoo.com*/*,parm3 parm1,http://*.google.com*/*,parm3
if (grep {$time_url_hits->[$i]->{url}} @url_list){ #print "found \n"; ... <then later> foreach (@url_list) { <do stuff for each unique filter string>