RFC: basic regex implementation

[Stephen M. Webb]

This is a first pass for a C++0x regex implementation.  Very basic  
functionality only (BREs only, no backrefs, no character classes), not  
production code yet, still not caught up to n3090.  Looking for  
feedback before I put more effort in.

I have removed TR1 support:  what's there is there.

-- 
Stephen M. Webb
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