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use URI;
$u1 = URI->new('http://www.comp.leeds.ac.uk/Perl/');
...
else {
   print "oops\n";
}

u1.host=www.comp.leeds.ac.uk
u2.host=www.comp.leeds.ac.uk
URL's host are the same

PARSING URIs WITH REGEXP
As an alternative to this module, the following (official) regular exp
+ression can be used to decode a URI:
...
  my($scheme, $authority, $path, $query, $fragment) =
  $uri =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:\?([^#]*))?(?:#
+(.*))?|;
The URI::Split module provide the function uri_split() as a readable a
+lternative.

use URI;
$u1 = URI->new('http://www.comp.Leeds.ac.uk/Perl/')->canonical();
...
else {
   print "oops\n";
}