// Uppgift: Del 1: Hitta while-loopar och dess villkor. Del 2: Läs in text och identifiera alla inbäddade tal.
// Nyckelord: boost::regex (std::regex), raw-string-literal

#include <iostream>

// C++11 std::regex kompilerar med g++, men fungerar ännu inte att använda
//#include <regex>
//using namespace std;

// Installation: sudo apt-get install libboost-all-dev
// Kompilering: g++ -std=c++11 -lboost_regex
#include <boost/regex.hpp>
using namespace boost;

using std::cin;
using std::cout;
using std::endl;
using std::string;

int main()
{
  // Del 1
  {
    cout << "Mata in tecken: " << endl;
    // A raw string start with R"( and end with )" in g++
    regex r( R"(^\s*while\s*\((.*)\)\s*$)" );
    
    string input;
    while (getline(cin, input))
    {
      smatch m;
      if (regex_match(input, m, r))
      {
        smatch::const_iterator i = m.begin();

        cout << "Entire match (while): " << *i++ << endl;
        cout << "Capture (expression): " << *i << endl;
      }
    }
  }
  cin.clear();
  // Del 2
  {
    cout << "Mata in tecken igen: " << endl;
    regex r("[0-9]+");
    
    string input;
    while (cin >> input)
    {
      smatch m;
      while (regex_search(input, m, r))
      {
        for (smatch::const_iterator i = m.begin(); i != m.end(); ++i)
        {
          cout << *i << endl;
        }
        input = m.suffix();
      }
    }
  }
  cout << endl;
  return 0;
}