stripping data

Ouch, please let's not go with regsub to solve such a simple problem. Very pretty all on one line & everything, but very expensive command to invoke regardless how simple the operation itself might be.

Why not simply use the "domain" command:

 
 when HTTP_REQUEST {  
      HTTP::redirect "https://www.domain1.com/nsa/+homePage=[domain [HTTP::host] 2]"      
  }

which will return only the last 2 parts of any domain name.

If you truly need to operate only on those domains with www. prefix, then use the starts_with operator to condition the change as in colin's example:

  
  when HTTP_REQUEST {  
     if { [HTTP::host] starts_with "www." } {        
        HTTP::redirect "https://www.domain1.com/nsa/+homePage=[domain [HTTP::host] 2]"      
     } else {       
         HTTP::redirect "https://www.domain1.com/nsa/+homePage=[HTTP::host]"        
     }       
  }

/deb