<?
$file=file_get_contents('listurl.txt');
preg_match_all("/\?key=(.+)?/i",$file,$o);
print_r($o[1]);
?>

<?php

$file="http://site.com?key=teen_video";
preg_match_all("/\?key=(.+)?/i",$file,$o);
$bodytag = str_replace("_", " ", $o[1][0]);
print_r($bodytag);


?>

$file="http://site.com/teen_video.html";
preg_match_all("/\.(.+)?/i",$file,$o);
preg_match_all("/\/(.+)?/i",$o[1][0],$o);
$key = str_replace("_", " ", $o[1][0]);
$key = str_replace(".html", " ", $key);
print_r($key);

$url="http://site.com/teen_video.html";
preg_match ("~\.(com|net|org|biz)/(\?key=|)(.+)(\.html|$)~U", $url, $key);
$key=str_replace("_"," ",$key[3]);

$u=parse_url($url);
if (strpos($u['path'],".html")!==false) $key=str_replace(array("/",".html"),'',$u['path']);
elseif(strpos($u['query'],"key=")!==false) $key=str_replace("key=",'',$u['query']);
else echo "а хуй его знает...\n";