#include <regex>
#include <string>
#include <iostream>
using namespace std;
 
int main() {
	regex r(R"('[^\\']*(?:(?:''|\\.)[^\\']*)*')");
	string s(R"(arg1('value1') arg2('value '')2') arg3('user\'~!@#$%^&*_~!@#$%^&"*_-=+[{]}\|;:<.>?21**()**'))");
	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.str() << std::endl;
    }
    return 0;
}

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