RealSense SDK supports JSpeech Grammar Format (JSGF) (https://www.w3.org/TR/jsgf/). Everything which is supported by JSGF, is supported by RealSense SDK. As you can see in JSGF standard, wildcards are not supported by JSGF.
Also, unfortunately it’s not possible to switch between the "Command and Control" and "Dictation" modes.
But to resolve the issue you can run two sessions in different modes in parallel and match results.