正则表达式：网页爬虫：从TXT中获取邮箱地址（获取的练习，缺点：一行只能匹配一个）

import java.util.regex.*;
import java.io.*;
class L
{
    public static void main(String[] args) throws Exception
    {
        getMail();
    }
    public static void getMail() throws Exception
    {
        BufferedReader bufr=new BufferedReader(new FileReader("m.txt"));
        String line=null;
        String reg="[a-zA-Z_0-9]+@[a-zA-Z0-9]+(\.[a-zA-Z]+)+";//"\w=@\w+(\.\w+)+";
        Pattern p=Pattern.compile(reg);

        while((line=bufr.readLine())!=null)
        {
            Matcher m=p.matcher(line);
            while(m.find())
            {
                System.out.println(m.group());
            }
        }

    }
}