Here you can find the source of validateEmail(String aEmailAddress)
public static boolean validateEmail(String aEmailAddress)
//package com.java2s; /*// ww w . jav a2 s . c om * Copyright (C) 2003-2014 eXo Platform SAS. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 3 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ public class Main { /** * Validate email according rules of eXo cloud */ public static boolean validateEmail(String aEmailAddress) { if (aEmailAddress == null) return false; boolean result = true; if (!hasNameAndDomain(aEmailAddress)) { result = false; } return result; } /** * Check whether the email has username and domain * * @param aEmailAddress * @return */ private static boolean hasNameAndDomain(String aEmailAddress) { String[] tokens = aEmailAddress.split("@"); return tokens.length == 2 && tokens[0].trim().length() > 0 && tokens[1].trim().length() > 3 && tokens[1].split("\\.").length > 1 && tokens[1].split("\\.")[1].length() > 1; } }