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In my current project boost::regex was used previously from version v3 (boost 1.30.2) and there was no problem. Because I use a third party SDK that contains boost 1.33.1 I want to use boost and regex (v4) from this SDK. In the project there is a source file that includes "boost/regex.hpp". In the release version the file compiles, but in the debug version I get a lot of errors like:

char_regex_traits.hpp(34) : error C2976: 'boost::regex_traits' : too few template arguments /basic_regex.hpp(186) : error C2825: 'traits': must be a class or namespace when followed by '::' basic_regex.hpp(186) : error C2039: 'size_type' : is not a member of '`global namespace''

I have now removed the preprocessor definition '_DEBUG' from the VC8 project that contains the source file but this makes no difference. Is there any idea what's going on here ?

Nope, it's a new one on me, but please note that is a really old Boost version now.

The only thing I can think of is that maybe you have the include paths set correctly in the release build, but mangled somehow in the debug build settings.

HTH, John.

Thanks John, I have now found the answer: Someone had entered special settings for the source file, there was /D "BOOST_REGEX_NO_FWD" and /D "STRICT" in the debug version. This seemed to work with regex v3, but not with regex v4. Wolfgang