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Message: [QUOTE="¿ÖÐ, post: 3540989"] #include <iostream> #include <string> #include <boost/regex.hpp> using namespace std; int main(int argc, char* argv[]) { string inStr = "123456" "abcde" "1-2"; std::string regstr = "(\\d+)|" "(a-z)"; boost::regex _reg(regstr); boost::smatch what; std::string::const_iterator _start = inStr.begin(); std::string::const_iterator _end = inStr.end(); while (boost::regex_search(_start, _end, what, _reg)) { std::string msg1(what[1].first, what[1].second); cout << msg1.c_str() << endl; _start = what[1].second; } return 0; } run result: 123456 1 2 why can't find "abcde"? [/QUOTE]