Extract all IPv4 from .txt file

ip-extractor.java

public static void main(String[] args) throws IOException {
    System.out.println("Welcome to IP-EXTRACTOR");
    System.out.println("Make sure you have ip.txt file in the same directory");
    System.out.println("Press Enter to start");

    Scanner scanner = new Scanner(System.in);
    scanner.nextLine();

    Pattern ipPattern = Pattern.compile("\\b(?:[0-9]{1,3}\\.){3}[0-9]{1,3}\\b");

    PrintWriter printWriter = new PrintWriter("result.txt");
    List<String> strings = Files.readAllLines(Paths.get("ip.txt"), Charset.defaultCharset());

    for (String line : strings) {
        Matcher matcher = ipPattern.matcher(line);
        while (matcher.find()) {
            String  ip = matcher.group();
            printWriter.println(ip);
        }
    }

    printWriter.close();
}