Consumer dies with exception when using special characters in correspondent detection

[texel-sensei]

I had the paperless-consumer die, with an exception in the re module.

It happened because I had set up an Correspondent any tag, which contained a + sign (string was something like "foo + bar"). Removing the + did resolve the error.

Traceback

Traceback (most recent call last):
  File "./manage.py", line 11, in 
    execute_from_command_line(sys.argv)
  File "/home/paperless/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line
    utility.execute()
  File "/home/paperless/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 365, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/paperless/venv/lib/python3.8/site-packages/django/core/management/base.py", line 288, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/paperless/venv/lib/python3.8/site-packages/django/core/management/base.py", line 335, in execute
    output = self.handle(*args, **options)
  File "/home/paperless/paperless/src/documents/management/commands/document_consumer.py", line 99, in handle
    self.loop(loop_time, mail_delta)
  File "/home/paperless/paperless/src/documents/management/commands/document_consumer.py", line 108, in loop
    self.loop_step(mail_delta, start_time)
  File "/home/paperless/paperless/src/documents/management/commands/document_consumer.py", line 122, in loop_step
    self.file_consumer.consume_new_files()
  File "/home/paperless/paperless/src/documents/consumer.py", line 117, in consume_new_files
    if not self.try_consume_file(file):
  File "/usr/lib/python3.8/contextlib.py", line 75, in inner
    return func(*args, **kwds)
  File "/home/paperless/paperless/src/documents/consumer.py", line 178, in try_consume_file
    document_consumption_finished.send(
  File "/home/paperless/venv/lib/python3.8/site-packages/django/dispatch/dispatcher.py", line 176, in send
    return [
  File "/home/paperless/venv/lib/python3.8/site-packages/django/dispatch/dispatcher.py", line 177, in 
    (receiver, receiver(signal=self, sender=sender, **named))
  File "/home/paperless/paperless/src/documents/signals/handlers.py", line 25, in set_correspondent
    potential_correspondents = list(Correspondent.match_all(document.content))
  File "/home/paperless/paperless/src/documents/models.py", line 86, in match_all
    if tag.matches(text):
  File "/home/paperless/paperless/src/documents/models.py", line 110, in matches
    if re.search(r"\b{}\b".format(word), text, **search_kwargs):
  File "/usr/lib/python3.8/re.py", line 201, in search
    return _compile(pattern, flags).search(string)
  File "/usr/lib/python3.8/re.py", line 304, in _compile
    p = sre_compile.compile(pattern, flags)
  File "/usr/lib/python3.8/sre_compile.py", line 764, in compile
    p = sre_parse.parse(p, flags)
  File "/usr/lib/python3.8/sre_parse.py", line 948, in parse
    p = _parse_sub(source, state, flags & SRE_FLAG_VERBOSE, 0)
  File "/usr/lib/python3.8/sre_parse.py", line 443, in _parse_sub
    itemsappend(_parse(source, state, verbose, nested + 1,
  File "/usr/lib/python3.8/sre_parse.py", line 671, in _parse
    raise source.error("multiple repeat",
re.error: multiple repeat at position 18