用于查找文件中所有IP地址的C++代码

#include<iostream>
#include <fstream>
#include<regex>

int main() {
    std::ifstream input_file("input.txt");
    std::string line;
    std::regex ip_regex(R"((\d{1,3}\.){3}\d{1,3})");

    while (std::getline(input_file, line)) {
        std::sregex_iterator matches_begin(line.begin(), line.end(), ip_regex);
        std::sregex_iterator matches_end;

        for (std::sregex_iterator it = matches_begin; it != matches_end; ++it) {
            std::cout << "IP address found: " << it->str()<< std::endl;
        }
    }

    return 0;
}