This is bit of a sanity check. I’ve used the regular expression conditional check with single and multiline text columns often, but today tried to do as much for a choice column only to be greeted with the same dropdown values of the choice column proper:

One way I can get around this is, I think, to assign my regexp to a variable and instead of using Value, use Workflow Data. But that seems like a roundabout way to accomplish what I thought used to be a straight forward procedure.
Is this the intended behavior for this scenario?
Do you get the same behavior in your version of Nintex on Prem?
If not, which version are you using?