regexlerle pek aram yok bayagi ugrastim halledemedim ama su sekilde cozdum olayi;
$kaynak = file_get_contents("http://video.google.com/videoplay?docid=".$_GET['vID']);
$d=explode('thumbnailUrl\x3d',$kaynak);
$dd=explode('\\',$d[1]);
$d_vl=$dd[0];
$hex = array("%3A", "%2F", "%3F", "%3D", "%26");
$chr = array(":", "/", "?", "=", "&");
$img= str_replace($hex, $chr, $d_vl);
echo '<img src="https://www.r10.net/php/'.$img.'"/>';
umarim isini gorur.