Select member from within two pools via 4th octet value in URI

is it something like this?

 configuration

[root@ve11c:Active:In Sync] config  tmsh list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:80
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 9
}
[root@ve11c:Active:In Sync] config  tmsh list ltm pool foo
ltm pool foo {
    members {
        200.200.200.101:80 {
            address 200.200.200.101
        }
    }
}
[root@ve11c:Active:In Sync] config  tmsh list ltm pool foobar
ltm pool foobar {
    members {
        200.200.200.111:80 {
            address 200.200.200.111
        }
    }
}
[root@ve11c:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when RULE_INIT {
   List of pool name
  set static::poollist { foo foobar }
   Parameter name
  set static::uriparam "member"
}
when HTTP_REQUEST {
  set param [URI::query "?[HTTP::query]" $static::uriparam]
  if { $param ne "" } {
    foreach name $static::poollist {
      foreach mbr [active_members -list $name] {
        if { [lindex $mbr 0] ends_with $param } {
          log local0. "Param=$param Pool=$name Pool member=$mbr"
          pool $name members [lindex $mbr 0] [lindex $mbr 1]
          return
        }
      }
    }
  } else {
     No parameter
  }
}
}

 /var/log/ltm

[root@ve11c:Active:In Sync] config  tail -f /var/log/ltm
Mar 10 22:21:14 ve11c info tmm[15262]: Rule /Common/qux : Param=111 Pool=foobar Pool member=200.200.200.111 80
Mar 10 22:21:24 ve11c info tmm[15262]: Rule /Common/qux : Param=101 Pool=foo Pool member=200.200.200.101 80