Regroover is not a general purpose source separator, it is a beat-making tool that explores source separation as the way to enable new beat-making workflows. In other words, it analyzes your clip and identifies underlying layers with similar sonic and rhythmic characteristics.
So... the answer is that it works for all kind of grooves, but the split results will vary depending on the imported audio. In a lot of cases, especially when importing an electronic drum groove, Regroover can indeed recognize different instruments of the beat.
Many people experiment with different sound samples and use Regroover by -abusing- it, for example by loading synth or orchestral grooves.
Sometimes the results are inspiring and foster creativity!
The best thing you can do, is to download the fully functional 14-days demo and experiment with your own audio files!
Don’t forget to visit the Videos page for some Regroover tutorials & tips.