variable passing problem

I have the following:

" <form> <label>Document Search</label> <fieldset> <input type="text" token="document_name"> <label>Document Name</label> <default>*</default> </input> <input type="time"/> </fieldset> <row>

<param name="search">| savedsearch "document_search" | search document_name="$document_name$"| table _time,printer_name,document_name,printed_pages,User </param> <option name="drilldown">none</option> </row> </form> "

I want to pass the document name the user has supplied and pass it to the search.

When I do this, the search is just *

I also tried cdata but could not get it to work. The problem is the search contains a bunch of regex - so I keep getting xml errors.