I've created a Plug-in and made the description attribute mandatory.
This works well if you leave it empty but if you type in just spaces it
is considered valid. I've tried different combinations of regex
expressions in the Regular Expression control property but everything
I've tried sees all values as either valid or invalid, regardless of
what I type in the attribute.
Again, I'm looking for a regex that requires at least one non-whitespace
character in the attribute.