Locale and traits class selection

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### Locale and traits class selection

The following macros (see user.hpp) control how Boost.Regex interacts with the user's locale:

macro | description
--- | ---
BOOST_REGEX_USE_C_LOCALE | Forces Boost.Regex to use the global C locale in its traits class support: this is now deprecated in favour of the C++ locale.
BOOST_REGEX_USE_CPP_LOCALE | Forces Boost.Regex to use std::locale in it's default traits class, regular expressions can then be imbued with an instance specific locale. This is the default behaviour on non-Windows platforms.
BOOST_REGEX_NO_W32 | Tells Boost.Regex not to use any Win32 API's even when available (implies BOOST_REGEX_USE_CPP_LOCALE unless BOOST_REGEX_USE_C_LOCALE is set).