package Game;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStreamReader;import java.util.regex.Matcher;import java.util.regex.Pattern;public class Main {    public static void main(String[] args) throws IOException {        File file=new File("D:\\index.html");        BufferedReader buf=new BufferedReader(new InputStreamReader(new FileInputStream(file)));        String str=null;        String regex="(.)+@(.)+(\\.[a-z]+){1,}";        Pattern pattern=Pattern.compile(regex);        while((str=buf.readLine())!=null)        {            Matcher matcher=pattern.matcher(str);            while(matcher.find())            System.out.println(matcher.group());        }        buf.close();    }}