Traffic routing with iRules

Excellent this works really well. My only concern is if they have on separate subdomains duplicated URI's. like on one subdomain they want /index.html to be direct to the legacy server, but want it to go through to new production on another subdomain. Would something like this work?

when HTTP_REQUEST {
     set hostlist1 [list email.example.com www.example.com test.example.com test1.example.com]
     set hostlist2 [list staff.example.com owa.example.com external.example.com test2.example.com]
    
     if { [string tolower [HTTP::host]] equals "testwww.example.com" } {
          pool $HTTP_pool }
     elseif { [lsearch $hostlist1 [string tolower [HTTP::host]]] ne -1 } {
          switch -glob [string tolower [HTTP::uri]] {
               ...
          }
     }    
     elseif { [lsearch $hostlist2 [string tolower [HTTP::host]]] ne -1 } {
          switch -glob [string tolower [HTTP::uri]] {
               ...
          }
     }    
}
 

Not sure, what do you think?