string字符串比较和替换

#include <string>
#include <iostream>

using namespace std;

int main()
{
    string str("a bc abc abcd abcde hello");
    string searchString("hello");
    string replaceString("ab");

    string::size_type pos = 0;
    
    while((pos = str.find(searchString, pos)) != string::npos) {
        str.replace(pos, searchString.size(), replaceString);
        pos++;
    }
    cout << str << endl;
    return 0;
}