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namespace boost{ template <class charT, class implementationT = sensible_default_choice> struct regex_traits : public implementationT { regex_traits() : implementationT() {} }; template <class charT> struct c_regex_traits; template <class charT> class cpp_regex_traits; template <class charT> class w32_regex_traits; } // namespace boost
        The class regex_traits is
        just a thin wrapper around an actual implementation class, which may be one
        of:
      
c_regex_traits: this
            class is deprecated, it wraps the C locale, and is used as the default
            implementation when the platform is not Win32, and the C++ locale is
            not available.
          cpp_regex_traits: the
            default traits class for non-Win32 platforms, allows the regex class
            to be imbued with a std::locale instance.
          w32_regex_traits: the
            default traits class implementation on Win32 platforms, allows the regex
            class to be imbued with an LCID.
          The default behavior can be altered by defining one of the following configuration macros in boost/regex/user.hpp
c_regex_traits
            the default.
          cpp_regex_traits
            the default.
          All these traits classes fulfil the traits class requirements.