zearth on "can I used slug instead of ID in add_rewrite_rule?"

question can I just used slug name instead of id for this kind of add_rewrite_rule

add_rewrite_rule('news/([^/]+)/?$','index.php?page_id=$matches[1]','top');

I'm not sure if what parameters for the slug in query, what I see on several samples are page_id only and I cannot find any information for slug.

thanks