#include #include #include #include std::vector extract_tag(std::istream& is, std::string tag_name) { std::vector body_tokens; std::string token; while (is >> token && token != ('<' + tag_name + '>')) ; while (is >> token && token != ("')) body_tokens.push_back(token); return body_tokens; } template void display(std::ostream& os, const container_type& container) { for (auto& element : container) os << element << '\n'; } std::string text = R"( This is a test message. )"; int main() { std::istringstream in_stream(text); display(std::cout, extract_tag(in_stream, "body")); }