Added .cat domain. Issue #107105. Thanks jlinares!

link.module

@@ -348,7 +348,7 @@ function link_validate_url($text) {
   '/^((' . $allowed_protocols . '):\/\/)?'.
   '('.
     // domains
-    '(([a-z0-9]([a-z0-9\-_]*\.)+)(aero|arpa|biz|com|coop|edu|gov|info|int|jobs|mil|museum|name|nato|net|org|pro|travel|mobi|[a-z]{2}))'.
+    '(([a-z0-9]([a-z0-9\-_]*\.)+)(aero|arpa|biz|com|cat|coop|edu|gov|info|int|jobs|mil|museum|name|nato|net|org|pro|travel|mobi|[a-z]{2}))'.
     // OR ip addresses
     '|(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})'.
   ')'.