Regex find/replace is not something that has never been done before, not anything groundbreaking. If this works best for you for the language you are using, then by all means. I am not saying anything bad about the program, indeed, I think it does appear better than Notepad++ in many ways, and I will definitely be giving it a try.
As for regex find/replace, that's not even uncommon in an IDE. For a text editor, doing it in all source files, yes, that is uncommon.