[v3] update <regex> to N3225 draft

[Jonathan Wakely]

My last patch had a stupid thinko, we need to use char_traits not strlen.

2011-02-15  Jonathan Wakely  <jwakely.gcc@gmail.com>

        * include/bits/regex.h (match_results::format): Use char_traits.

Tested x86_64-linux (though as the fact the last checkin also passed
tests shows, our tests for <regex> are incomplet and incorrekt.)
Committed to trunk
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