代码片段

//http://solarianprogrammer.com/2011/10/12/cpp-11-regex-tutorial/
#include <iostream>
#include <regex>
#include <string>

using namespace std;
using namespace std::tr1;
int main()
{
    string input;
    //regex integer("(\\+|-)?[[:digit:]]+");
    regex integer("(\\+|-)?[\\d]+");
    //regex integer("(\\+|-)?[[:digit:]]+");
    //As long as the input is correct ask for another number
    while(true)
    {
        cout<<"Give me an integer!"<<endl;
        cin>>input;
        //Exit when the user inputs q
        if(input=="q")
            break;
        if(regex_match(input,integer))
            cout<<"integer"<<endl;
        else
        {
            cout<<"Invalid input"<<endl;
        }
    }
    //return 0;
}