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Traceback (most recent call last):
  File "test/testbuttifier.py", line 4, in <module>
    import buttifier
  File "/home/dentist/buttebot/test/../buttifier.py", line 7, in <module>
    class word(object):
  File "/home/dentist/buttebot/test/../buttifier.py", line 9, in word
    camelcase_ex = re.compile(r'(?<[a-z])[A-Z]')
  File "/usr/lib/python2.6/re.py", line 190, in compile
    return _compile(pattern, flags)
  File "/usr/lib/python2.6/re.py", line 245, in _compile
    raise error, v # invalid expression