I want to reject filenames which begin with one or more exclamation marks. I first tried using a regex to match just one leading ! and then I tried a regex to match multiple leading !'s.
If I use this as a filename filter: ^!
then I get a yellow icon and the header goes into NB's Failed Files list. The status is Downloaded.
OTOH if I use this as a filename filter: ^!+
then I get a yellow icon and the header goes into NB's Failed Files list. However the status is Post Purged.
Post Purged tell me not the article is no longer available so if for some reason I had wanted to double check the article and see it then I would not bother trying because NB tells me (incorrectly) that it is no longer on any of my servers.
Is this a bug? Are there other regexes I could use instead of ^!+ which would work in NB in the same way as ^! works?