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[Patch] Let ordinary escaping in POSIX regex be valid

From: Tim Shen <timshen91 at gmail dot com>
To: "libstdc++" <libstdc++ at gcc dot gnu dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Thu, 26 Sep 2013 22:15:14 -0400
Subject: [Patch] Let ordinary escaping in POSIX regex be valid
Authentication-results: sourceware.org; auth=none

POSIX ERE says that escaping an ordinary char, say R"\n" is not
permitted, because 'n' is not a special char. However, they also say
that : "Implementations are permitted to extend the language to allow
these. Conforming applications cannot use such constructs."

So let's support it not to make users surprised.

Booted and tested under -m32 and -m64

Thanks!


-- 
Tim Shen

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Follow-Ups:
- Re: [Patch] Let ordinary escaping in POSIX regex be valid
  - From: Jonathan Wakely

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