[Bug-tar] Excluding directories based on content

[Dr. David Alan Gilbert]

Hi,
  Is there a way to exclude a directory based on the content
of that directory?  In particular I'm after a way to say
'don't back up a directory if it contains a file called .....'
(where ..... is a regexp or at least a list of a few filenames).
I see there is support explicitly for a cache dir exclusion,
but I was looking for something a little more generic?

Thanks in advance,

Dave
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