[MacPerl-AnyPerl] Filter a url

[Eelco Alosery]

Hello,
I want to filter a url from $ENV{'HTTP_REFERER'}
If the url is http://www.testdomein.nl/test.html
I only want a result testdomein.nl
I have been testing whit this script
$url =~ s/.*?\.(.+?)\/.*?/$1/is;
It delets the first part of the url corect, but after .nl it deletes 
the slash and not the remaining tekst.
The result is testdomein.nltest.html

What is it i do wrong.
Thanks,
Eelco Alosery