Eli Zaretskii <eliz@gnu.org> writes:

> Hmm... I wonder why the code bothers specifying the allowed characters
> explicitly, and in particular why it only allows ASCII characters.
>
> Does the code work if the directory has non-ASCII characters instead
> of "++"?

No, it breaks.  For now, I've attached a patch to use "[:alnum:]",
which fixes that use case for me.

Regarding your first question, I'm not exactly sure why.  Maybe we
could go as far as just doing "[[:print:]]*" for that part - or
simply ".*".  What do you think?

Thanks,
Stefan Kangas