如何在C++中对字符串进行标记？

#include<iostream>
#include <cstring>
using namespace std;

int main() {
    string str = "Hello, world!";
    string subStr = "world";
    char* p = strtok((char*)str.c_str(), ", ");
    while (p != NULL) {
        if (strcmp(p, subStr.c_str()) == 0) {
            cout << "找到了子字符串：" << p << endl;
        }
        p = strtok(NULL, ", ");
    }
    return 0;
}