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Re: [PATCH 1/3] Properly expand @configure_input@ in config.status.

From: Paul Eggert
Subject: Re: [PATCH 1/3] Properly expand @configure_input@ in config.status.
Date: Sat, 05 Jan 2008 22:25:07 -0800
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux)

Paolo Bonzini <address@hidden> writes:

> Yes, it is undefined

I don't see why 's&foo&\&&' is undefined.  The POSIX standard says:

   Any character other than backslash or <newline> can be used instead
   of a slash to delimit the BRE and the replacement. Within the BRE
   and the replacement, the BRE delimiter itself can be used as a
   literal character if it is preceded by a backslash.

Therefore, preceding & by a backslash makes it a "literal character",
i.e., a character that is not special.  Where's the ambiguity?

Even if the standard were ambiguous (which I don't yet see), there is
a practical advantage to behaving compatibly with other 'sed'
implementations in this area.

Anyway, if you like, I can file an interpretation request with the
POSIX folks about this.

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