string::rfind

//// string::rfind


#include "stdafx.h"
#include <iostream>
#include <string>
#include <cstddef>
using namespace std;

int main(int argc, char* argv[])
{
	string str ("i love you do you love me.");
	string key ("love");
	
	size_t found = str.rfind(key);
	if (found!=string::npos)
		str.replace (found,key.length(),"like");
	//cout<<string::npos<<endl;
	cout << str <<endl;
	
	return 0;
}