[Patch] regex_iterator and regex_token_iterator implementation

[Tim Shen]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57513 is already in the
testsuite and can passed(even before this patch?).

To fully test it, a fully regex_search implementation is required. I'm
working on a (damning) backtracking engine for it.


--
Tim Shen

iterators.patch
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