I had built boost version 1.40 (some time ago) myself with MSVC 2008 Express, a complete build. I now wanted to use the regex library; I left the default option of statically linking it in (no #define BOOST_REGEX_DYN_LINK) and also count on auto-linking (no BOOST_REGEX_NO_LIB).
Using regex_search, I keep getting linker errors:
<snip> I've never seen those before, the missing symbols are std lib ones not Boost.Regex ones BTW. I would guess there's something unusual about how the library was built or how your app is being built. The quick solution would be to define BOOST_REGEX_NO_LIB and add all the libs/regex/src/*.cpp files directly to your project. Otherwise check that regex really was built with VC9 and not some other compiler by mistake, and check to see what defines and/or "odd" compiler options you may be using in your project. HTH, John.