Need help with a GLOB expression

Hi,

I have the following group hierarchy:

Infrastructure Services/Primary/EMEA/Citrix
Infrastructure Services/Primary/EMEA/Network Services
Infrastructure Services/Primary/EMEA/Network Services/Routers
Infrastructure Services/Primary/EMEA/Network ServicesSwitches
Infrastructure Services/Primary/EMEA/Backups

In an inventory report I want to include all devices except devices under "Network Services".

I've tried numerous expressions and thought the following would be the one to go with:

Infrastructure Services/Primary/EMEA/!(Network Services)

But this still includes the devices in groups under Network Services. Any ideas?