In Intellij, how do I toggle between camel case and underscore spaced?

Question

At my company we have two different style guides for java vs sql. In java I have a field named historyOfPresentIllness and when i write the sql, I want to name it

Answer 1

Answer above is almost perfect, but note that it will change variables like _something or this._something into Something and this.Something. I didn't want that in my case, as leading _ was used to denote "private" variables (old JS project). I slightly modified this approach:

Find: (\w)[_]{1,1}([a-z])

Replace: $1\U$2

This will ensure that only variables with _ is in the middle will be affected.