If you're not familiar with re2, you may be familiar with a couple of other little projects that the author, Russ Cox, is involved with: Go (http://golang.org/) and Plan 9 (http://swtch.com/plan9port/).
Also, here's a great bit of technical history behind Russ' re2 implementation, and why pyre2 will never be completely compatible with Python's re (without fallback):
Also, here's a great bit of technical history behind Russ' re2 implementation, and why pyre2 will never be completely compatible with Python's re (without fallback):
http://swtch.com/~rsc/regexp/regexp1.html
http://swtch.com/~rsc/regexp/regexp2.html
http://swtch.com/~rsc/regexp/regexp3.html