Insight Editor Issue: regex filtering?

[ExecutiveFunctioning]

I'm having an issue while editing an insiqht.

Insight ID: 637409F9-582F-46FA-8DD7-BB025FDD8B7A

I'm getting overly complex data about load times, and I'd like to simplify it so it's just the first integer after Optional, otherwise this chart shows garbage. I want to see the results grouped by integer, and clearly the way I'm using regex here is not correct. Is there another way?

[winsmith]

This is possible using a regular expression extraction function. Unfortunately the editor doesn't support these, so you'll have to convert to a Custom Query first.