at $customer we have vlan 23 and vlan 123 both available to the same vmware setup.
When creating a host on vlan23, foreman has a tendency to auto select the vlan 123 network in vmware.
While this can be manually corrected (by always double checking on the bottom of the "interface" page that the right network is selected) it causes mistakes and frustration.

Foreman should probably prefer the more exact match of "vlan23" over "vlan123". so we should just expect a non numeric character to preceed the vlan id.