On Fri, 11 Aug 2000, Paul Eggert wrote:

> 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.  Unix Version 7 didn't have them.

IRIX 6.5 sed, for one, does NOT support ?, but it DOES support \{0,1\}.

-Steve



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