[ak217]

Hi, could you give some details about those regexes that you were trying to run? Are you sure these are problems with the PyPy implementation, not with the Python regexp spec itself? I've used grouping and back-references with pypy with no problems so far, so I wonder which case you're talking about.

[ColdAsIce]

Yes I am sure it was the pypy implementation since the same regex would do fine on python2.7.

Unfortunately I dont have the regex at hand, just remembering it was something with groups and backtracking.