package des;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class IP {
 /**
 * @param args
 */
 public static void main(String[] args) {
 // TODO Auto-generated method stub
    IP p=new IP();
    String ii="127.0.0.1";
    String ii2="127.0.0.";
    String ii3="127.0.0.1000";
    String ii4="256.0.0.1";
    String ii5="127.0.0.gg";
    String ii6="127.h.0.1";
    String ii7="127.555.0.1";
    String ii8="127.00.0.1";
    String ii9="127.0.04.1";
    String ii10="127.100.#.1";
    String ii11="127.*.0.1";
    String ii12="127.0.0.000";
    String ii13="192.168.3.12";
    System.out.println("來自 www.dbjr.com.cn 的測試結(jié)果：");
    p.isMatches(ii);
    p.isMatches(ii2);
    p.isMatches(ii3);
    p.isMatches(ii4);
    p.isMatches(ii5);
    p.isMatches(ii6);
    p.isMatches(ii7);
    p.isMatches(ii8);
    p.isMatches(ii9);
    p.isMatches(ii10);
    p.isMatches(ii11);
    p.isMatches(ii12);
    p.isMatches(ii13);
 }
 public boolean isMatches(String ip){
 boolean flag=false;
 try{
//  String regex="[0-9]+[.][0-9]+[.][0-9]+[.][0-9]+";
  String regex="^((\\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]|[*])$";
  //正確的是
//String regex="^((\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5])\\.){3}(\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])$";
//  String regex="\\b((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\.((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\.((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\.((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\b";
  Pattern p=Pattern.compile(regex);
  Matcher m=p.matcher(ip);
  if(m.find()){
   System.out.println("successss");
  return true;
  }else{
  System.out.println("falsss");
  }
 }catch(Exception e){
  e.printStackTrace();
 }
 return flag;
 }
}

String regex="^((\\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]|[*])$";