uncaught sre_constants.error

[Curtis Hovey]

Traceback (most recent call last):
  File "/home/curtis/.gnome2/gedit/plugins/gdp/find.py", line 274, in on_find_in_files
    find_worker.run()
  File "/home/curtis/.gnome2/gedit/plugins/gdp/find.py", line 114, in run
    self.pattern, substitution=self.substitution):
  File "/home/curtis/.gnome2/gedit/plugins/gdp/find.py", line 36, in find_matches
    match_re = re.compile(match_pattern)
  File "/usr/lib/python2.7/re.py", line 190, in compile
    return _compile(pattern, flags)
  File "/usr/lib/python2.7/re.py", line 245, in _compile
    raise error, v # invalid expression
sre_constants.error: unbalanced parenthesis