Regex filter Variable drop down

I have some Template Variables created that contain a large list of values. When selecting a variable using the drop down list at the top of a dashboard, I can see there’s a basic substring search of the values that filters the results.

It would be nice if I could type a Regex pattern and have that filter the possible values for me (eg: “.ec.”). I’ve tried a few things, but as soon as I put in anything that looks like a regular expression the filter returns no results, so I can only assume it is substring search only. Is there any way to get regex search functionality, or is this a feature request?

This is for Grafana version 6.2.5.