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());      }  }         

文章转自庄周梦蝶  ，原文发布5.16