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From: Lars Magne Ingebrigtsen <larsi@gnus.org>
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Subject: Re: Pre-Processed maiil splitting under Gnus?
Date: 12 Jan 1999 18:21:32 +0100
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Hrvoje Niksic <hniksic@srce.hr> writes:

> 1) As demonstrated by Tom Lord, GNU regex (which both Emacsen use) is
>    still not POSIX.
> 
> 2) Why are there, at least in XEmacs, two sets of functions, posix-
>    regexp functions, and "normal" regexp functions?  Also, the
>    internal code has various posix-p flags that apparently specify
>    whether POSIX behaviour is desired.  I though the reason for
>    duplicate functionality was to gain speed in the non-POSIX (the
>    more usual) case.

My understanding of this is that certain Posixly things were
incorporated -- in specific, a more complex backtracking thing.
Backtracking can be very slow, so the non-Posix functions use a
simpler version.  So the naming is misleading -- it should probably be 
excessive-backtracking-p instead of posix-p, but the latter rolls more 
easily off the tongue, perhaps.

-- 
(domestic pets only, the antidote for overdose, milk.)
  larsi@gnus.org * Lars Magne Ingebrigtsen