[ubuntu] squidguard blocking subdomains

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http://ubuntuforums.org – hi i have squidguard and i want to block all subdomains and all directorys of domain but not root domain. example: i want access to www.poker.com but not access all subdomains like www.xxx.poker.com , www.example.poker.com etc, and subdirectory like www.poker.com/game , www.poker.com/travel , etc I want only access to root www.poker.com how write in urls file of blacklists of squidguard? thks. (Hardware)