The Regex for removal below cutoff?

I'd copied/used An Extract set from somewhere's around Marc's site
that removes many things when I hit "Reply". But I think I messed it
up.

From the two dashes with the blank line above and below, what is the
correct Regex to use? AND if people I write to seem to *insist* on
quoting my entire email, and RE-quoting it, then what to use for:
           >> dash-dash and
           >  dash-dash


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Thanks for the help ...
Robert D.
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