[xwiki-users] Hi there! How to create validations using regular expressions?

Hi there! How to create validations using regular expressions? Is this ( http://platform.xwiki.org/xwiki/bin/view/DevGuide/Creating+a+form+with+valid... ) still up to date with xwiki601? I just added the expression to the class ( http://i.imgur.com/u9sieKB.png ) in many different ways using sure thing expressions too like one from the wiki (/^.{2,20}$/) and i don't get it to work... do i really have to add <input type="hidden" name="xvalidate" value="1" /> and if yes where to add it? I am using the class editor to add and modify the class properties and not html. Thanks in advance!