判断email格式的正则表达式

转自：http://www.blogjava.net/killme2008/archive/2007/02/06/98243.html

常用的几个:

^[_/.0-9a-z-]+@([0-9a-z][0-9a-z-]+/.)+[a-z]{2,3}$

^[_a-z0-9-]+(/.[_a-z0-9-]+)*@[a-z0-9-]+(/.[a-z0-9-]+)*$

^(([0-9a-zA-Z]+)|([0-9a-zA-Z]+[_.0-9a-zA-Z-]*[0-9a-zA-Z]+))@([a-zA-Z0-9-]+[.])+([a-zA-Z]{2}|net|com|gov|mil|org|edu|int)$

^([a-z0-9A-Z]+[-|//.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?//.)+[a-zA-Z]{2,}$

/w+([-+.]/w+)*@/w+([-.]/w+)*/./w+([-.]/w+)*


在JAVA中使用:

import java.sql.*;
import java.io.*;
import java.util.regex.*;

public class test{
	public static void main(String[] args){
	try{
		String s = "";
		while(!s.equals("q")){
			System.out.print("input:");
			DataInputStream in = new DataInputStream(new BufferedInputStream(System.in));
			s = in.readLine();
			System.out.println("your input is :"+s);
			String check = "^([a-z0-9A-Z]+[-|//.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?//.)+[a-zA-Z]{2,}$";
			Pattern regex = Pattern.compile(check);
            Matcher matcher = regex.matcher(s);
            boolean isMatched = matcher.matches();
            if(isMatched){
                System.out.println("it's a email");
            }else{
				System.out.println("it's not a email");
            } 
		}
    }catch(Exception e){
        System.out.println("error"+e.getMessage());
    }
}