Slugs for non western languages (asian, arabic)

What would be the best way to convert slugs for non western languages normally I do this…

public function getSlug($title){
		$clean = iconv('UTF-8', 'ASCII//TRANSLIT', $title);
		$clean = preg_replace("/[^a-zA-Z0-9\\/_| -]/", '', $clean);
		$clean = strtolower(trim($clean));
		$clean = preg_replace("/[\\/_| -]+/", $this->replace_space, $clean);

        return $clean;

But when put some asian characters in there, it will be empty… is there anyway to make this smarter so it will leave asian characters intact?

What happens with the asian characters when you just run iconv by itself, and maybe change ASCII to something else?