Parse node name from url with iRule

e.g.

 config

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:80
    ip-protocol tcp
    mask 255.255.255.255
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 46
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm data-group internal host-to-node
ltm data-group internal host-to-node {
    records {
        MSxxxxx {
            data 200.200.200.101:80
        }
    }
    type string
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  log local0. "host=[HTTP::host] uri=[HTTP::uri]"
  if { [scan [HTTP::host] {%[^-]} ht] == 1 } {
    log local0. "ht=$ht"
    set nd [split [class match -value $ht equals host-to-node] :]
    log local0. "nd=$nd"
    node [lindex $nd 0] [lindex $nd 1]
    log local0. "cmd=node [lindex $nd 0] [lindex $nd 1]"
  }
}
}

 /var/log/ltm

[root@ve11a:Active:In Sync] config  tail -f /var/log/ltm
Jul  2 19:27:13 ve11a info tmm[29362]: Rule /Common/qux : host=MSxxxxx-help-sp.domain.net uri=/something
Jul  2 19:27:13 ve11a info tmm[29362]: Rule /Common/qux : ht=MSxxxxx
Jul  2 19:27:13 ve11a info tmm[29362]: Rule /Common/qux : nd=200.200.200.101 80
Jul  2 19:27:13 ve11a info tmm[29362]: Rule /Common/qux : cmd=node 200.200.200.101 80