Forward DNS query to the specific node/pool based on query string - iRule

Hello Everyone,

I have a scenario where the DNS query need to send to the specific node/pool based on a query string.

Example, when user trying to resolve xyz-internal.example.com, the request should be send to the certain node/pool.

Is there any way that, iRule can match the specific string (internal) and based on that forward the request or it can be achieved in any other way?

I have tried on LTM in the LAB but seems like not working.

when DNS_REQUEST {
  if {[DNS::question name] matches "internal"} {
    node "10.10.10.10"
  } else {
    node "23.81.50.150"
  }
}