Zend Framework: how to use validator in router.xml

[shOOter]

I've created the validator SportNameValidator and I want to use it to check variables in the url. How can I put a validator to routes.xml?This is the part of file:\[code\]<rss_top_news_by_sportname><type>Zend_Controller_Router_Route_Regex</type><route>export/rss/top/news/([a-z]+).xml</route><defaults> <controller>export</controller> <action>rssTopNewsBySportName</action></defaults><map> <sportname>1</sportname></map>\[/code\]