#include <algorithm>
#include <iostream>
#include <iterator>
#include <regex>
#include <string>
#include <vector>
 
using namespace std;
 
int main() {
	const auto input = "please split,this,csv, ,line,\\,\n"s;
	const regex re{ "((?:[^\\\\,]|\\\\.)+)(?:,|$)" };
	const vector<string> m_vecFields{ sregex_token_iterator(cbegin(input), cend(input), re, 1), sregex_token_iterator() };
 
	cout << input << endl;
 
	copy(cbegin(m_vecFields), cend(m_vecFields), ostream_iterator<string>(cout, "\n"));
}

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