boost c application development cookbook
ool is_valid_email(const std::string& email) { const boost::regex pattern(R"(^[\w.%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$)"); return boost::regex_match(email, pattern); } ``` Use in `main`: ```cpp int main() { std::string email = " [email protected] "; if (is_valid_email(email)) { std::cout <