Re: flush-lines and regexp problems with emacs 22.0.x

[martin rudalics]

> 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.