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[Patch] Fix empty grouping problem in regex

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: Mon, 19 Aug 2013 18:07:10 +0800
Subject: [Patch] Fix empty grouping problem in regex

Before this patch, it causes the executor into infinite loop.

Tested under x86_64. I'll test -m32 and check-debug before committing.

Thanks!

-- 
Tim Shen

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Attachment: emptygroup.patch
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Follow-Ups:
- Re: [Patch] Fix empty grouping problem in regex
  - From: Jakub Jelinek
- Re: [Patch] Fix empty grouping problem in regex
  - From: Paolo Carlini

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