C++ Regex 邮箱校验

 #include <regex>
 #include <iostream>
 #include <string>

 bool is_email_valid(const std::string& email)
 {
    // define a regular expression
    const std::tr1::regex pattern
       ("(\\w+)(\\.|_)?(\\w*)@(\\w+)(\\.(\\w+))+");

    // try to match the string with the regular expression
    return std::tr1::regex_match(email, pattern);
 }

 int main()
 {
    std::string email1 = "[email protected]";
    std::string email2 = "[email protected]";
    std::string email3 = "[email protected]";
    std::string email4 = "marius@domain";

    std::cout << email1 << " : " << (is_email_valid(email1) ?
       "valid" : "invalid") << std::endl;
    std::cout << email2 << " : " << (is_email_valid(email2) ?
       "valid" : "invalid") << std::endl;
    std::cout << email3 << " : " << (is_email_valid(email3) ?
      "valid" : "invalid") << std::endl;
    std::cout << email4 << " : " << (is_email_valid(email4) ?
      "valid" : "invalid") << std::endl;

    return 0;
 }

转帖：http://ubuntuforums.org/showthread.php?t=1114404

转自http://blog.csdn.net/Mirage520/article/list/2