[Patch] Fix undefined behaviors in regex

[Tim Shen]

On Wed, Oct 16, 2013 at 6:33 PM, Paolo Carlini <paolo.carlini@oracle.com> wrote:
> By the way, please feel free to prepare a reduced testcase for the
> -fsanitize people (Marek, Jakub?)

Here it is.

And we should get undefined behaviors before this commit(r203732).


-- 
Tim Shen
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