Specifying an invalid regex in Options > Advanced > Ignore paths (ignore_regex) and loading a file will crash Picard. E.g. settings this to something invalid like "["

Traceback (most recent call last):
File "./picard/tagger.py", line 392, in event
event.run()
File "./picard/util/thread.py", line 39, in run
self.func(*self.args, **self.kwargs)
File "./picard/tagger.py", line 534, in process
self.add_files(result)
File "./picard/tagger.py", line 465, in add_files
ignoreregex = re.compile(pattern)
File "/usr/lib/python3.8/re.py", line 250, in compile
return _compile(pattern, flags)
File "/usr/lib/python3.8/re.py", line 302, 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 549, in _parse
raise source.error("unterminated character set",
re.error: unterminated character set at position 7
zsh: abort (core dumped) ./tagger.py