Scripting

So I am trying to see what logic exists for the custom inventory rules, specifically trying to look for negating options.  

I'm focusing on the "RegistryValueEquals" section and I want to only return ones that do not equal a specific number or text string.   This is tying into some additional steps so just returning the values and then running a report using smart labels to get ones that do not match is not a solution for what I need to accomplish.  

I see there are operators for AND/OR logic so wondering if there is a list of any other operators that can be used "NOT", "!=" or something like that and if there are any others for any other reason. 

Out side of this I know i could also probably use the shell command option to run a batch or powershell script and do the logic there but I'm trying to keep things simple in the system and not rely on additional scripts if possible.