Added support for \g \K and \R.

[SVN r52592]

doc/html/boost_regex/background_information/standards.html

@@ -28,7 +28,7 @@
       Conformance</a>
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@@ -36,7 +36,7 @@
         Report on C++ Library Extensions</a>.
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         rather than a Unicode escape sequence; use \x{DDDD} for Unicode escape sequences.
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         (??{code}) Not implementable in a compiled strongly typed language.
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         a custom traits class.
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