Regex to match domain for cookie

[B. Fongo]

How do I match a domain name starting from the dot? 
 
# Match something like these
".domain4you.co.uk"
".domain-house.de"
 
 
This is what I have:
 
 
@domains = ("http://www.domain.com ", "http://www.domain4you.co.uk  
        "http://www.domain-house.de"; "https//rrp.cash-day.com"
      );
 
 
foreach (@domains){
 
            $_ =~ /^\D ([\.A-Za-z0-9]+[\.\D])$/; # What is wrong here?
# Need ".domain.com", but I get "ww.domain.com"
            $x = $1;
            print "$x";
 
 
}
 
 
 
Babs