如何在某个十进制模式上进行模式匹配

Question

我正在尝试在C ++中执行模式匹配，格式为......

  ###.######## (example input would be 135.123551235)

我尝试了以下模式，但它与我输入的数据不匹配...

  // get the points entered
  getline(cin, x1ANDy1);

  regex r("([0-9]+)\.([0-9]+)", regex_constants::basic);
  if (regex_match(x1ANDy1, r))
  {
      cout << "Data has been entered properly.";
  }
  else
  {
      cout << "Data has been entered in the improper format, please re-enter your data.";
  }

Answer 1

这种模式将是＆＃34; \ d {3}。\ d {9}＆＃34;对于精确的3位数点（。）9位数或＆＃34; \ d {lowerbound，upperbound}。\ d {lowerbound，upperbound}＆＃34;如果你想允许某些数字量。或者如果您不想限制它，请将花括号替换为*。