如何编写C++正则表达式，根据某些条件识别字符串中选定的浮点数或整型数？

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

int main() {
    std::string input = "This is a sample text with numbers: 123, 3.14, and -42.5";
    std::regex pattern(R"((-?\d+(\.\d+)?))");

    std::smatch matches;
    std::string::const_iterator iter = input.begin();
    std::string::const_iterator end = input.end();

    while (std::regex_search(iter, end, matches, pattern)) {
        for (const auto& match : matches) {
            std::cout << match << " ";
        }
        std::cout << std::endl;
        iter = matches.suffix().first;
    }

    return 0;
}