Bulk Rename Utility

Is it possible for BRU to scan through a folder, recognize 2 files of the same name but one file has "_02" in the end, and have it automatically add "_01" to the file without the "_02" at the end?

example:
before:
samefilename
samefilename_02

after:
samefilename_01
samefilename_02

Is BRU ale to do this?

I would think that could be done with JavaScript renaming (though I wouldn't know how).

Yes, it should be possible to do with Javascript, is the requirement "if name does not end with _02 then add _01" ?
Could also be done without Javascript by selecting all files that do not end with _02 and then adding _01?