i.e:

#include
#include
#include

int main()
{
std::string line;
boost::regex pat( “^Subject: (Re: |Aw: )*(.*)” );

while (std::cin)
{
std::getline(std::cin, line);
boost::smatch matches;
if (boost::regex_match(line, matches, pat))
std::cout << matches[2] << std::endl;
}
}

When attempting to compile I get:

**** Build of configuration Debug for project boost test ****

**** Internal Builder is used for build ****
g++ -oboosttest.exe src\boosttest.o
src\boosttest.o:c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/boost/regex/v4/basic_regex.hpp:262: undefined reference to `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits > >::do_assign(char const*, char const*, unsigned int)’
src\boosttest.o: In function `perl_matcher’:
c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/boost/regex/v4/perl_matcher.hpp:347: undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator > >, boost::regex_traits<char, boost::cpp_regex_traits > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits > > const&, boost::regex_constants::_match_flags)’
src\boosttest.o:c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/boost/regex/v4/regex_match.hpp:50: undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator > >, boost::regex_traits<char, boost::cpp_regex_traits > >::match()’
src\boosttest.o:c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/boost/regex/v4/cpp_regex_traits.hpp:888: undefined reference to `boost::re_detail::cpp_regex_traits_implementation::transform(char const*, char const*) const’
src\boosttest.o:c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/boost/regex/v4/cpp_regex_traits.hpp:892: undefined reference to `boost::re_detail::cpp_regex_traits_implementation::transform_primary(char const*, char const*) const’
src\boosttest.o:c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/boost/regex/v4/perl_matcher_common.hpp:479: undefined reference to `boost::match_results<__gnu_cxx::__normal_iterator, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator > > >::maybe_assign(boost::match_results<__gnu_cxx::__normal_iterator, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator > > > const&)’
src\boosttest.o:c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/boost/regex/v4/cpp_regex_traits.hpp:436: undefined reference to `boost::re_detail::get_default_error_string(boost::regex_constants::error_type)’
src\boosttest.o:c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/boost/regex/v4/cpp_regex_traits.hpp:438: undefined reference to `boost::re_detail::get_default_error_string(boost::regex_constants::error_type)’
src\boosttest.o:c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/boost/regex/pattern_except.hpp:75: undefined reference to `boost::re_detail::raise_runtime_error(std::runtime_error const&)’
src\boosttest.o:c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/boost/regex/v4/perl_matcher_non_recursive.hpp:197: undefined reference to `boost::re_detail::get_mem_block()’
src\boosttest.o:c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/boost/regex/v4/perl_matcher_non_recursive.hpp:978: undefined reference to `boost::re_detail::put_mem_block(void*)’
collect2: ld returned 1 exit status
Build error occurred, build is stopped
Time consumed: 484 ms.

“If you want a debugger, instead of building gdb, I suggest using MSVC’s excellent debugger. Look at libnuwen for an example of how to build programs with GNU Make and debug them with MSVC (hint: after running $(BATCH_FILE) , type devenv program.exe program.cc to open it up in the debugger). “

I have only one doubt. Can I use GDB with this version of MinGW?