java正则表达式判断 ip 地址是否正确解析

public class ClassWork05 {
  public static void main(String[] args) {
    System.out.println(IsIp.isIp("10.10.1.1"));
  }
}
class IsIp{
  public static boolean isIp(String ip) {
    boolean b1 = ip.matches("([1-9]|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3}");
    return b1;
  }
}
// 输出结果为 true