pool redirect based on uri

If you are worried about you list of URIs expanding you should start with a data group. Put all your URIs in a data group with their value set to the associated pool for that uri. i.e /blah1 would have the value field set to insidepool8101(or whatever you name the pool). The data group can be updated whenever you want to add an additional uri/pool. Then you can use an iRule like this. And yes, the pool selection will not affect the request being sent to the pool.

when HTTP_REQUEST {
    if { [class match [string tolower [HTTP::path]] starts_with "uriDataGroup" }{
        pool [class match -value [string tolower [HTTP::path]] starts_with "uriDataGroup"]
    }
    else {
        pool defaultPool
    }
}