if( getUrl() == 'http://site.com/catalog/visa/' || getUrl() == 'http://site.com/catalog/visa/([A-Z0-9]*)' )
$str = "http://site.com/catalog/visa/bla";
if (preg_match("/http:\/\/site.com\/catalog\/visa\/([A-Z0-9]*)/", $str)) {
echo "Matched";
}