#include <regex>
#include <string>
#include <iostream>
#include <time.h>
using namespace std;
 
int main()
{
	struct tm tm;
    time_t t;
        string data("On 2015-12-23, the shop will be closed, but on 2016-01-03, it will be open. Invalid date: 2016-13-32. ID: 1022015-12-233333.");
        std::regex pattern("\\b\\d{4}[-]\\d{2}[-]\\d{2}\\b");
        std::smatch result;
 
        while (regex_search(data, result, pattern)) {
        	if (strptime(result[0].str().c_str(), "%Y-%m-%d", &tm) != NULL) {
			  std::cout << result[0] << std::endl;
        	}
        	data = result.suffix().str();
		}
}

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