java正则表达式

package file;

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

public class pat 
{
   public static void main(String[] arg) throws Exception
   {
	   String str="eponline@yahoo.com.cn";

	   Pattern pattern = Pattern.compile("[\\w\\.\\-]+@([\\w\\-]+\\.)+[\\w\\-]+",Pattern.CASE_INSENSITIVE);
	  //[\w\.\-]+@([\w\-]+\.)+[\w\-]+
	   System.out.println(pattern);
	   System.out.println(pattern.pattern());

	   //pattern.matcher(input)
	   Matcher matcher = pattern.matcher(str);

	   System.out.println(matcher.matches());
	   System.out.println(matcher);

	  // Thread.sleep(1000);

	   //System.out.println(matcher.matches());
	   System.out.println("hello");

	   Pattern pattern2 = Pattern.compile("<.+?>", Pattern.DOTALL);
	   Matcher matcher2 = pattern.matcher("<a href=\"index.html\">主页</a>");
	   String string = matcher2.replaceAll("");
	   System.out.println(string);

	   /**
	    * # [\u2E80-\u9FFF]+    匹配所有东亚区的语言   
    	  # [\u4E00-\u9FFF]+     匹配简体和繁体    
		  # [\u4E00-\u9FA5]+     匹配简体 
		  #ok  ([\u4e00-\u9fa5]+)  [\u4E00-\u9FA5]+ 大小写都可以
		  Pattern,Matcher实例化一次，可用多次
	    */

	   String regx1="(\\d{1,10})";
	   String regx2="([\u4E00-\u9FA5]+)";
	   Pattern pattern3 = Pattern.compile(regx2);
	   Matcher matcher3 = pattern3.matcher("hello2560world10000中国7f530上海 南京test698010");
	  // matcher3.find();
	   System.out.println("tgc:"+matcher3.groupCount());


	   int g[] = null;
	   ArrayList List = new ArrayList();
	   int i =0;
	   while(matcher3.find())
	   {
	     if(i==0)
	     {
	    	 matcher3.replaceFirst("CHINA"); 
	     }
		 System.out.println(i+":"+matcher3.group());
	     // System.out.println("pos:"+matcher3.start());
	      //g[i] = Integer.parseInt(matcher3.group());
		 List.add(matcher3.group()) ;

	      i++;
	   }

	   //list
	   for(int y=0;y<List.size();y++)
	   {
		   System.out.println("list:"+List.get(y));
	   }
	   System.out.println("=================================");
	   Iterator  it=  List.iterator();
	   while(it.hasNext())
	   {
		   System.out.println("list:"+it.next());
	   }

   }
}