Hi, the simple code is below: ____________________________________________________________________ #include <iostream> #include <string> #include "boost/regex.hpp" using namespace boost; regex expression("this is ([[:digit:]]*)"); int main(int argc, char* argv[]) { while (true) { char buf[1000]; memset(buf, 0, 1000); std::cin.getline(buf, 1000); std::string str(buf); cmatch match; if (!regex_match(str, match, expression)) { std::cout<<"Don't match"<<std::endl; continue; } for (int i = 0; i < match.size(); i++) { std::string msg; msg.assign(match[i].first, match[i].second); std::cout<<msg<<std::endl; } } return 0; } ____________________________________________________________________________________ the makefile is below ------------------------------------------------------ INCLUDE_DIR = /unzipped/boost_1_31_0/ -I/usr/local/include/stlport/ #INCLUDE_DIR = /unzipped/boost_1_31_0/ LIB_DIR = /unzipped/boost_1_31_0/libs/regex/build/gcc/ -L/usr/local/lib/ #LIB_DIR = /unzipped/boost_1_31_0/libs/regex/build/gcc/ LINK = boost_regex-gcc-1_31 -lstlport_gcc #LINK = boost_regex-gcc-1_31 FLG = -Wall all : regex_sample.o g++ regex_sample.o -L$(LIB_DIR) $(FLG) -l$(LINK) -o sample %.o : %.cpp g++ -I$(INCLUDE_DIR) -L$(LIB_DIR) $(FLG) -l$(LINK) -c $< -------------------------------------------------------------- and the error information is : ------------------------------------------------------------ [root@guanbin regex]# make g++ -I/unzipped/boost_1_31_0/ -I/usr/local/include/stlport/ -L/unzipped/boost_1_31_0/libs/regex/build/gcc/ -L/usr/local/lib/ -Wall -lboost_regex-gcc-1_31 -lstlport_gcc -c regex_sample.cpp regex_sample.cpp: In function `int main(int, char**)': regex_sample.cpp:37: warning: comparison between signed and unsigned integer expressions g++: -lboost_regex-gcc-1_31: linker input file unused because linking not done g++: -lstlport_gcc: linker input file unused because linking not done g++ regex_sample.o -L/unzipped/boost_1_31_0/libs/regex/build/gcc/ -L/usr/local/lib/ -Wall -lboost_regex-gcc-1_31 -lstlport_gcc -o sample regex_sample.o(.gnu.linkonce.t._ZN5boost9re_detail12perl_matcherIPKcN4_STL9allocatorINS_9sub_matchIS3_EEEENS_12regex_traitsIcEENS5_IcEEEC1ES3_S3_RNS_13match_resultsIS3_S8_EERKNS_14reg_expressionIcSA_SB_EENS_15regex_constants12_match_flagsE+0x51): In function `boost::re_detail::perl_matcher<char const*, _STL::allocator<boost::sub_match<char const*> >, boost::regex_traits<char>, _STL::allocator<char> >::perl_matcher[in-charge](char const*, char const*, boost::match_results<char const*, _STL::allocator<boost::sub_match<char const*> > >&, boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> > const&, boost::regex_constants::_match_flags)': : undefined reference to `boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> >::get_traits() const' regex_sample.o(.gnu.linkonce.t._ZN5boost9re_detail12perl_matcherIPKcN4_STL9allocatorINS_9sub_matchIS3_EEEENS_12regex_traitsIcEENS5_IcEEEC1ES3_S3_RNS_13match_resultsIS3_S8_EERKNS_14reg_expressionIcSA_SB_EENS_15regex_constants12_match_flagsE+0x8a): In function `boost::re_detail::perl_matcher<char const*, _STL::allocator<boost::sub_match<char const*> >, boost::regex_traits<char>, _STL::allocator<char> >::perl_matcher[in-charge](char const*, char const*, boost::match_results<char const*, _STL::allocator<boost::sub_match<char const*> > >&, boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> > const&, boost::regex_constants::_match_flags)': : undefined reference to `boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> >::empty() const' regex_sample.o(.gnu.linkonce.t._ZN5boost9re_detail12perl_matcherIPKcN4_STL9allocatorINS_9sub_matchIS3_EEEENS_12regex_traitsIcEENS5_IcEEE24estimate_max_state_countEPNS4_26random_access_iterator_tagE+0x2c): In function `boost::re_detail::perl_matcher<char const*, _STL::allocator<boost::sub_match<char const*> >, boost::regex_traits<char>, _STL::allocator<char> >::estimate_max_state_count(_STL::random_access_iterator_tag*)': : undefined reference to `boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> >::size() const' regex_sample.o(.gnu.linkonce.t._ZN5boost9re_detail12perl_matcherIPKcN4_STL9allocatorINS_9sub_matchIS3_EEEENS_12regex_traitsIcEENS5_IcEEE9match_impEv+0x94): In function `boost::re_detail::perl_matcher<char const*, _STL::allocator<boost::sub_match<char const*> >, boost::regex_traits<char>, _STL::allocator<char> >::match_imp()': : undefined reference to `boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> >::mark_count() const' regex_sample.o(.gnu.linkonce.t._ZN5boost9re_detail8access_tIcNS_12regex_traitsIcEEN4_STL9allocatorIcEEE5firstERKNS_14reg_expressionIcS3_S6_EE+0xd): In function `boost::re_detail::access_t<char, boost::regex_traits<char>, _STL::allocator<char> >::first(boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> > const&)': : undefined reference to `boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> >::first(boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> > const&)' regex_sample.o(.gnu.linkonce.t._ZN5boost9re_detail11raise_errorINS_12regex_traitsIcEEEEvRKT_j+0x21): In function `void boost::re_detail::raise_error<boost::regex_traits<char> >(boost::regex_traits<char> const&, unsigned)': : undefined reference to `boost::re_detail::raise_regex_exception(_STL::basic_string<char, _STL::char_traits<char>, _STL::allocator<char> > const&)' regex_sample.o(.gnu.linkonce.t._ZN5boost9re_detail8access_tIcNS_12regex_traitsIcEEN4_STL9allocatorIcEEE9can_startEcPKhh+0x24): In function `boost::re_detail::access_t<char, boost::regex_traits<char>, _STL::allocator<char> >::can_start(char, unsigned char const*, unsigned char)': : undefined reference to `boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> >::can_start(char, unsigned char const*, unsigned char, boost::re_detail::_narrow_type const&)' regex_sample.o(.gnu.linkonce.t._ZN5boost9re_detail16re_is_set_memberIPKccNS_12regex_traitsIcEEN4_STL9allocatorIcEEEET_S9_S9_PKNS0_11re_set_longERKNS_14reg_expressionIT0_T1_T2_EE+0x41): In function `char const* boost::re_detail::re_is_set_member<char const*, char, boost::regex_traits<char>, _STL::allocator<char> >(char const*, char const*, boost::re_detail::re_set_long const*, boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> > const&)': : undefined reference to `boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> >::get_traits() const' regex_sample.o(.gnu.linkonce.t._ZN5boost9re_detail16re_is_set_memberIPKccNS_12regex_traitsIcEEN4_STL9allocatorIcEEEET_S9_S9_PKNS0_11re_set_longERKNS_14reg_expressionIT0_T1_T2_EE+0x258): In function `char const* boost::re_detail::re_is_set_member<char const*, char, boost::regex_traits<char>, _STL::allocator<char> >(char const*, char const*, boost::re_detail::re_set_long const*, boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> > const&)': : undefined reference to `boost::c_regex_traits<char>::transform(_STL::basic_string<char, _STL::char_traits<char>, _STL::allocator<char> >&, _STL::basic_string<char, _STL::char_traits<char>, _STL::allocator<char> > const&)' regex_sample.o(.gnu.linkonce.t._ZN5boost9re_detail16re_is_set_memberIPKccNS_12regex_traitsIcEEN4_STL9allocatorIcEEEET_S9_S9_PKNS0_11re_set_longERKNS_14reg_expressionIT0_T1_T2_EE+0x34b): In function `char const* boost::re_detail::re_is_set_member<char const*, char, boost::regex_traits<char>, _STL::allocator<char> >(char const*, char const*, boost::re_detail::re_set_long const*, boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> > const&)': : undefined reference to `boost::c_regex_traits<char>::transform_primary(_STL::basic_string<char, _STL::char_traits<char>, _STL::allocator<char> >&, _STL::basic_string<char, _STL::char_traits<char>, _STL::allocator<char> > const&)' regex_sample.o(.gnu.linkonce.t._ZN5boost11basic_regexIcNS_12regex_traitsIcEEN4_STL9allocatorIcEEEC1EPKcjRKS5_+0x13): In function `boost::basic_regex<char, boost::regex_traits<char>, _STL::allocator<char> >::basic_regex[in-charge](char const*, unsigned, _STL::allocator<char> const&)': : undefined reference to `boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> >::reg_expression[not-in-charge](char const*, unsigned, _STL::allocator<char> const&)' regex_sample.o(.gnu.linkonce.t._ZN5boost11basic_regexIcNS_12regex_traitsIcEEN4_STL9allocatorIcEEED1Ev+0xd): In function `boost::basic_regex<char, boost::regex_traits<char>, _STL::allocator<char> >::~basic_regex [in-charge]()': : undefined reference to `boost::reg_expression<char, boost::regex_traits<char>, _STL::allocator<char> >::~reg_expression [not-in-charge]()' collect2: ld returned 1 exit status make: *** [all] Error 1 ------------------------------------------------------------------------------------- the environment is : linux redhat 9.0 gcc 3.2.2 boost_1_31_0 stlport_4_6_2 Who can help me? thanks Guan Bin gb0519@hotmail.com