$site = file_get_contents("http://yourdomain.com");
$degisken = ' var playerInstance = jwplayer("myElement");
playerInstance.setup({
sources: [ {(.*?)} ],
width: "690",
height: "360"
});';
preg_match_all($degisken,$site,$cikti);
print_r($cikti);
preg_match_all(): Delimiter must not be alphanumeric or backslash