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Date: Sat, 12 Aug 2000 12:02:21 +0200
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        autoconf AT gnu DOT org, ken AT gnu DOT org
In-reply-to: <200008111956.MAA12359@ruby.twinsun.com> (message from Paul
	Eggert on Fri, 11 Aug 2000 12:56:20 -0700 (PDT))
Subject: Re: portability of sed's \{0,1\}?
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> Date: Fri, 11 Aug 2000 12:56:20 -0700 (PDT)
> From: Paul Eggert <eggert AT twinsun DOT com>
> 
> Most likely, seds that don't support ? and \| also don't support
> \{m,n\}, as I recall that those features were introduced to USG Unix
> at about the same time.

My references indicate otherwise.  For example, SunOS 4.x man page
for ed(1) clearly says that \{m,n\} is supported, while ? and \| are
not.  This is consistent with the latter two not being part of BRE.

Ken, could you comment on this?