Excluding autocommands for files matching an exclusion pattern

Hi all,

I have right now an autocommand, au BufWritePost *.foo :run_cmd.

I want it to run upon writing all files matching *.foo, but not any files matching bar.*, or more equivalently bar.*.foo.

How can I disable the autocommand for files starting with bar? The full path of an ideally excluded file may be /tmp/dir/bar.qux.foo, while /tmp/dir/qux.foo should be included

Thanks, everyone!

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