#include <string>
#include <iostream>
#include <regex>
using namespace std;
 
int main() {
	std::regex r(R"(#.*|(\w+:\w+))");
	std::string s = "AA:BB CC:DD EE:FF #this is a comment XX:YY";
	for(std::sregex_iterator i = std::sregex_iterator(s.begin(), s.end(), r);
                             i != std::sregex_iterator();
                             ++i)
    {
        std::smatch m = *i;
        std::cout << m[1].str() << '\n';
    }
	return 0;
}
 

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