look-behind requires fixed-width pattern

[jschewebbn]

Using python2.7 with the head from tracboat I get the following error.

  File "/home/bbn-admin/tracboat/src/tracboat/migrate.py", line 29, in _wikiconvert
    return trac2down.convert(text, basepath, multiline, note_map=note_map, attachments_path=attachments_path, svn2git_revisions=svn2git_revisions)
  File "/home/bbn-admin/tracboat/src/tracboat/trac2down.py", line 219, in convert
    line = re.sub(r'\[(?<!!|wiki:)([A-Z][a-z]+[a-z0-9]*[A-Z][^\ \]]*)\]', r'[\1](\1)', line) # [WikiName] format
  File "/home/bbn-admin/tracboat/VENV/lib64/python2.7/re.py", line 151, in sub
    return _compile(pattern, flags).sub(repl, string, count)
  File "/home/bbn-admin/tracboat/VENV/lib64/python2.7/re.py", line 242, in _compile
    raise error, v # invalid expression
sre_constants.error: look-behind requires fixed-width pattern