If you think this really should work and you can reproduce it, you should consider reporting this problem to the Trac team.

Go to http://trac.edgewall.com/ and create a new ticket where you describe the problem, how to reproduce it. Don't forget to include the Python traceback found below.

TracGuide — The Trac User and Administration Guide
Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 299, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 189, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python2.3/site-packages/trac/ticket/web_ui.py", line 104, in process_request
    self._do_create(req, db)
  File "/usr/lib/python2.3/site-packages/trac/ticket/web_ui.py", line 163, in _do_create
    self._validate_ticket(req, ticket)
  File "/usr/lib/python2.3/site-packages/trac/ticket/web_ui.py", line 47, in _validate_ticket
    for field, message in manipulator.validate_ticket(req, ticket):
  File "build/bdist.linux-i686/egg/tracspamfilter/adapters.py", line 40, in validate_ticket
  File "build/bdist.linux-i686/egg/tracspamfilter/api.py", line 68, in test
  File "/usr/lib/python2.3/site-packages/trac/core.py", line 55, in extensions
    return filter(None, [component.compmgr[cls] for cls in extensions])
  File "/usr/lib/python2.3/site-packages/trac/core.py", line 186, in __getitem__
    component = cls(self)
  File "/usr/lib/python2.3/site-packages/trac/core.py", line 95, in maybe_init
    init(self)
  File "build/bdist.linux-i686/egg/tracspamfilter/filters/regex.py", line 33, in __init__
  File "build/bdist.linux-i686/egg/tracspamfilter/filters/regex.py", line 57, in _load_patterns
IndexError: list index out of range