Multiple Redirects

if it is always the same format like www.[host] need to be redirected to [host] then a simple iRule that extract the first part should do the job

But if it is not so consistent, you can build a datagroup which says for each host what should be the redirect

ex:

 
 this class definition is what you see in your bigip.conf file when you define a datagroup 
 class hostredirects { 
   "www.nnn.sitename.com http://nnn.sitename.com" 
   "www.nan.sitename.com http://someotherhost.nowhere.com" 
 } 
  
 when HTTP_REQUEST { 
   set location [findclass [HTTP::uri] $::hostredirects " "] 
   if { $location ne "" } 
     HTTP::redirect $location  
   } 
 }