Redirect + datagroup

I couldn't say exactly why but this won't work, you're doing too much at once. This should;

 when HTTP_REQUEST { 
  Compare the request URI with the strings in the uri-dg data group 
  and populate the variable: redirect with the associated value if  
  there is a match 
  set redirect [class match -value [HTTP::uri] equals dg_redirect] 
     
   As long as our variable: redirect isn't empty, perform the redirect 
   if { $redirect ne "" } { 
    HTTP::redirect "http://[HTTP::host]$redirect" 
   }  
  
   If there wasn't a match and variable: redirect is empty, do something 
   else instead 
   else { 
    log local0. "No redirect occurred for: [HTTP::uri]"     
   } 
 }