<NfoUrl dest="3">
   <RegExp input="$$1" output="&lt;url&gt;http://www.csfd.cz/film/\1&lt;/url&gt;&lt;id&gt;\1&lt;/id&gt;" dest="3">
      <expression>http://(?:www\.)?csfd.cz/film/(\d+)</expression>
   </RegExp>
</NfoUrl>