From -> http://yahoo.co.uk/notfound.html
extract only -> yahoo.co.uk
rhesa already suggested using a specialized module, which yields a superior solution, which is superior because it uses a a specialized module (and that's generally the case), but this shouldn't be hard to do with a match or split, in which case some familiarity with elementary regexen should help you. In particular the following should be fine for you:
my $url='http://yahoo.co.uk/notfound.html';
my $host=(split m(/+), $url)[1];
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