如何在c++中读取由反斜杠分隔的键对应的值

#include <iostream>
#include <string>
#include <sstream>

std::string getValueByKey(const std::string& input, const std::string& key) {
    std::istringstream iss(input);
    std::string token;

    while (std::getline(iss, token, '\\')) {
        std::size_t found = token.find(':');
        if (found != std::string::npos && token.substr(0, found) == key) {
            return token.substr(found + 1);
        }
    }

    return "";
}

int main() {
    std::string input = "key1:value1\\key2:value2\\key3:value3";
    std::string key = "key2";

    std::string value = getValueByKey(input, key);
    if (!value.empty()) {
        std::cout << "Value for key '" << key << "' is: " << value << std::endl;
    } else {
        std::cout << "Key '" << key << "' not found." << std::endl;
    }

    return 0;
}