Regex kullanmak yerine domdocument bence daha mantıklı olur.

function file_get_contents_utf8($fn) {
$content = file_get_contents($fn);
return mb_convert_encoding($content, 'UTF-8', mb_detect_encoding($content, 'UTF-8, ISO-8859-9', true));
}
$page = file_get_contents_utf8("https://www.google.com/search?hl=tr&q=Rafadan%20Tayfa%202:%20G%C3%B6beklitepe%20Film%20Konusu");
@$doc = new DOMDocument();
@$doc->loadHTML($page);
$xpath = new DomXPath($doc);
$nodeList = $xpath->query("//div[@class='BNeawe s3v9rd AP7Wnd']");
$node = $nodeList->item(0)->textContent;
echo($node);
?>


Takılırsan tekrar sorabilirsin. İşine yararsa ne mutlu bana.