string text = "岳云鵬的對象叫鐵錘";
  regex pattern("(.*)的對象叫(.*)");
 smatch results;
  if (regex_match(text, results, pattern)) {
   for (auto it = results.begin(); it != results.end(); ++it)
    cout << *it << endl;
  }
  else {
   cout << "match failed: " << text << endl;
  }
  // 岳云鵬的對象叫鐵錘
 // 岳云鵬
 // 鐵錘

/*
 * 輸入是789.123.456, 輸出的是789
 */
void get()
{
 std::regex ip_reg("(.*)\.123\.456");
 std::smatch matchResult;
  string inputStr;
  std::getline(std::cin,inputStr);
  //正則匹配
  if (std::regex_match(inputStr,matchResult,ip_reg))
  {
   cout << "Match: ";
   //打印子表達式結(jié)果
   for (size_t i = 1; i < matchResult.size(); ++i)
   {
    cout << matchResult[i] << " ";
   }
  }
  else
  {
   cout << "Not Match!";
  }
 }