C++有没有办法替换字符串中的多个标记

#include <iostream>
#include <string>
#include <map>

int main() {
    std::string str = "Hello <name>! Today is <day>.";
    std::map<std::string, std::string> replacements = {
        {"<name>", "John"},
        {"<day>", "Monday"}
    };

    for (const auto& pair : replacements) {
        size_t pos;
        while ((pos = str.find(pair.first)) != std::string::npos) {
            str.replace(pos, pair.first.length(), pair.second);
        }
    }

    std::cout << str << std::endl;  // 输出: Hello John! Today is Monday.

    return 0;
}

#include <iostream>
#include <string>
#include <map>
#include <regex>

int main() {
    std::string str = "Hello <name>! Today is <day>.";
    std::map<std::string, std::string> replacements = {
        {"<name>", "John"},
        {"<day>", "Monday"}
    };

    std::regex pattern;
    for (const auto& pair : replacements) {
        pattern = std::regex(pair.first);
        str = std::regex_replace(str, pattern, pair.second);
    }

    std::cout << str << std::endl;  // 输出: Hello John! Today is Monday.

    return 0;
}