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From: martin rudalics <rudalics@gmx.at>
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Subject: Re: flush-lines and regexp problems with emacs 22.0.x
Date: Wed, 17 Jan 2007 09:01:04 +0100
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 > I'd say that the blank line shouldn't be deleted because nothing is
 > matched on it. But the end point is on this line, so I'm not sure.
 > The flush-lines documentation is not clear about that.

`flush-lines' deletes everything from the beginning of the line where
the match starts to the beginning of the line following the end of the
match.  I think the documentation of `flush-lines' should be improved in
this regard.

 > (flush-lines "^\\(> \n\\)*> foo$\\(\n> .*\\)*") has no effect on it.

This is explained in the manuals:

      For historical compatibility reasons, `$' can be used only at the
      end of the regular expression, or before `\)' or `\|'.

 > (flush-lines "^\\(> \n\\)*> foo\\($\\|\\(\n> .*\\)+\\)") doesn't have
 > any effect either,

This is strange, it does match

 > foo

on my system, hence it should flush that line.  Please recheck.