findclass function doesnt work

I've not tested with IE. As a matter of fact, the browser is irrelevant. All that matters is that BIG-IP actually generates a response. The response is useless because of invalid Location, which is caused by findclass working slightly differently than as documented. So, with "work" I mean that BIG-IP generates the redirect response. I've assumed that your problem was that the redirect (302) response has not been generated at all.

The solution (i.e., redirect based on matching a class member and parsing out the redirect target) cannot work because findclass will never match a class member that is longer than the string to match (as I've explained and demonstrated earlier).

The only way how to achieve what you want (if I understand your goal correctly) is to use a chain of if-else statements like this:

rule redir-map {
   if(http_host == "www.test1.com") {
       redirect to "http://www.yahoo.com"
   } 
   else if(http_host == "www.test2.com") {
       redirect to "http://www.msn.com"
   }

The smart solution using findclass is unfortunately not going to work.