[patch] regex_traits implementation

Tim Shen timshen91@gmail.com
Wed Jul 3 04:15:00 GMT 2013

All fixed. I use `_RegexMask` rather than `const _RegexMask&` just
because, IMO, const reference is for something very large and doesn't
need to be every-byte-accessed.

Add _RegexMask::_S_valid_mask = 0x3 instead of using the literal everywhere.

Tim Shen
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