[Patch] Regex back-reference support

[Tim Shen]

On Sat, Aug 10, 2013 at 5:41 PM, Paolo Carlini <paolo.carlini@oracle.com> wrote:
> More important: we are adding support for a non trivial feature and not a single comment in the new code refers to it. This is not ok, please add at least 2 or 3.

Here it is. Two pieces of code concerning implementation logic is
commented. Add another testcase.

I'll test it again before final commit.


-- 
Tim Shen
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