Do we expect this to work on 64 bit Linux and python 2.6.5?  I've compiled and run some of my code through this, and there seems to be issues with non-greedy quantifier matching (at least relative to the old re module):

$ cat test.py
import re, regex

text = "(MY TEST)"
regexp = '\((?P<test>.{0,5}?TEST)\)'
print re.findall(regexp, text)
print regex.findall(regexp, text)


$ python test.py
['MY TEST']
[]

python 2.7 produces the same results for me.

However, making the quantifier greedy (removing the '?') gives the same result for both re and regex modules.