URL Rewrite iRule Help Requested

what about this?

when HTTP_REQUEST {
  switch -glob [HTTP::path] {
    "/" {
      HTTP::redirect "http://[HTTP::host]/irj/portal" 
    }
    "/sap*" {
      switch [HTTP::host] {
        "dms-pd.abc.com" { pool pool-10.10.10.1-50005 }
        "dms-dev.abc.com" { pool pool pool-10.10.10.2-8000 }
        default {
           do something
        }
      }
    }
    "/irj*" -
    "/webdynpro*" -
    "/rtmfCommunicator*" {
      pool pool-10.10.10.10-50000 
    }
    default {
       do something
    }
  }
}