Java - fetch id从链接中删除所有字符

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static void main(String[] args) {
        String url = "https://example.com/users/12345";
        String id = fetchIdFromUrl(url);
        System.out.println("ID: " + id);
    }

    public static String fetchIdFromUrl(String url) {
        Pattern pattern = Pattern.compile("\\d+");
        Matcher matcher = pattern.matcher(url);
        if (matcher.find()) {
            return matcher.group();
        }
        return null;
    }
}