regex is an alternative to the re package in the Python standard library. It is intended to act as a drop in replacement, and one day to replace re. regex is supported on Python 2.5, 2.6, 2.7 and 3.1.
For a full list of features see Python2/Features.rst or Python3/Features.rst.
To build and install regex for your default Python run
python setup.py install
To install regex for a specific version run setup.py with that interpreter, e.g.
python3.1 setup.py install