Java tutorial
//package com.java2s; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static boolean checkEmail(String email) { String regExp = "^([a-zA-Z0-9_\\.\\-])+\\@(([a-zA-Z0-9\\-])+\\.)+([a-zA-Z0-9]{2,4})+$"; Pattern p = Pattern.compile(regExp); Matcher m = p.matcher(email); return m.matches(); } }