java正则表达式判断是否IP地址

// 必须定义 `ShowMeBug` 入口类和 `public static void main(String[] args)` 入口方法
import java.util.Date;
import java.text.DateFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class ShowMeBug {
  public static final String KEY_USERNAME = "username";
  
 	public static boolean isIpAddress(String value) {
		Pattern pattern = Pattern.compile("^((\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]"
				+ "|[*])\\.){3}(\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])$");
		return pattern.matcher(value).matches();
	}
	public int delete() {
		return 0;
	}
  
public static void main(String[] args) {
String default_modify_time = null;

		Date date = new Date();
		java.text.DateFormat format2 = new java.text.SimpleDateFormat("yyyyMMddHHmmss");
		default_modify_time = format2.format(date);
    System.out.println(default_modify_time);
 
    StringBuilder builder = new StringBuilder("write_raw logo ");
    builder.append("default ");
    if(isIpAddress("192.168.11.1"))
    System.out.println(builder.toString());
  }
}