Here you can find the source of checkEmail(String email)
public static boolean checkEmail(String email)
//package com.java2s; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static boolean checkEmail(String email) { Pattern pattern = Pattern .compile("^([a-zA-Z0-9_\\-\\.]+)@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.)|(([a-zA-Z0-9\\-]+\\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$"); Matcher matcher = pattern.matcher(email); return matcher.matches(); }// ww w . jav a 2 s.c om }