Currently, when you apply the extract-regex-groups directive on non-string data types, there is no feedback to users. It seems as if the directive got applied, but it does not produce any results.
It seems like this happened in my case because it was applied on a column of type JSONArray. This should be fixed in two ways:
1. The point and click interaction for this directive should be disabled in the UI for non-String columns
2. If a user tries to apply it using the power mode, a proper error should be thrown, along with a call to action on what the user should do next.