How can I create an Azure policy that validates Resource Group Names

Question

I am trying to create an Azure policy which I can assign at the subscription level, and control the naming of the resource groups in the subscription.

Policies need

Answer 1

The resource groups are Microsoft.Resources/subscriptions/resourcegroups type. You can kinda infer that from the resource provider operations:

Get-AzureRmProviderOperation 'Microsoft.Resources/*'