BOOST_REGEX_DYN_LINK

For Microsoft and Borland C++ builds, this tells Boost.Regex that it should link to the dll build of the Boost.Regex. By default boost.regex will link to its static library build, even if the dynamic C runtime library is in use.

BOOST_REGEX_NO_LIB

For Microsoft and Borland C++ builds, this tells Boost.Regex that it should not automatically select the library to link to.

BOOST_REGEX_NO_FASTCALL

For Microsoft builds, this tells Boost.Regex to use the __cdecl calling convention rather than __fastcall. Useful if you want to use the same library from both managed and unmanaged code.