Java tutorial
//package com.java2s; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static boolean isAMail(String mail) { if (mail == null) return false; Pattern p = Pattern.compile("^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@"); Matcher m = p.matcher(mail); return m.matches(); } }