[Patch] match_results::format and regex_replace

[Tim Shen]

This patch complete the last two parts of the whole regex module, but
two problems left:

1) regex_traits<>::transform_primary [28.7.7]. I don't know how to
implement it correctly. Can anyone give some advice?

2) Digraph support. Is it need to be done, since the standard doesn't
specify it?

Tested under -m64. I'll do a full test before committing.

Thanks!


-- 
Tim Shen
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