[boost] few questions about regex V3 vs V4

Few questions about regex V3 : 1. what parts of boost.regex are available in V3? I just found (to my embarassment during discussion with my boss) that regex_replace is not available in V3. 2. what compilers are known to not work with V4, or (more precisely) : is there any reason to force MSVC6 into V3? 3. assuming that we build regex library files in V4, is it OK (well-defined behaviour) to link these .dll and .lib with code compiled with regex V3? TIA -- Bronek Kozicki brok@rubikon.pl http://b.kozicki.pl/