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Karl Kleinpaste <karl@charcoal.com> writes:

> This is really vile, but what I'm using these days is this group
> property for onelist/egroups lists:
> 
>  (banner . "^\\(> ?\\)?------------------------------------------------------------------------\n\\(.\\|\n\\)*")
> 
> Beware, quoted banners can begin the cutoff, which is (only very
> occasionally) a false positive.  Diddle with the "> " stuff to stop
> that particular misfeasance.  Personally, I like it that way, because
> people who are dim-witted enough to quote banners are generally people
> who are dim-witted enough to be uninteresting to read at all anyway.

Seems like your RE should have caught this dodo's quoted banner

[...]
> > ------------------------------------------------------------------------
> > Want to win airfare to Vegas for you and 20 friends, $15,000 and a
[...]

But it slips through.  Unless I'm reading your RE wrong it says
something like:

Lines begining with >SPC one or no repeat of <spc> one or no repeat of
whole string from >

Neither of the RE below  nails it either

  (banner . "^\\(> ?\\|>\\)?------------------------------------------------------------------------\n\\(.\\|\n\\)*")

 (banner . "^\\(> >\\|?\\)?------------------------------------------------------------------------\n\\(.\\|\n\\)*"))

I notice quite a hefty pause while gnus scans the banner I guess,
then it pops into view.

This was a rare instance to be sure so it is not really a problem,
just made me wonder what I don't know about the "?" operator.