Add some convenience functions to re2.py
Add some convenience functions to re2.py

andreasvc/pyre2,sunu/pyre2,pombredanne/pyre2,andreasvc/pyre2,axiak/pyre2,axiak/pyre2,pombredanne/pyre2,sunu/pyre2,simudream/pyre2,facebook/pyre2,pombredanne/pyre2,simudream/pyre2,facebook/pyre2