Jacques Grove <jacq...@tripitinc.com> added the comment:
Spoke too soon, although this might be a valid divergence in behavior:
$ cat test.py
import re, regex
text = "test: 2"
print regex.sub('(test)\W+(\d+)(?:\W+(TEST)\W+(\d))?', '\\2 \\1, \\4 \\3', text)
print re.sub('(test)\W+(\d+)(?:\W+(TEST)\W+(\d))?', '\\2 \\1, \\4 \\3', text)
$ python test.py
2 test,
Traceback (most recent call last):
File "test.py", line 6, in <module>
print re.sub('(test)\W+(\d+)(?:\W+(TEST)\W+(\d))?', '\\2 \\1, \\4 \\3',
text)
File "/usr/lib64/python2.7/re.py", line 151, in sub
return _compile(pattern, flags).sub(repl, string, count)
File "/usr/lib64/python2.7/re.py", line 278, in filter
return sre_parse.expand_template(template, match)
File "/usr/lib64/python2.7/sre_parse.py", line 787, in expand_template
raise error, "unmatched group"
sre_constants.error: unmatched group
----------
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<http://bugs.python.org/issue2636>
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