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("^\\w+([-.]\\w+)*@\\w+([-]\\w+)*\\.(\\w+([-]\\w+)*\\.)*[a-z]{2,3}$"); Matcher matcher = pattern.matcher(email); if (matcher.matches()) { return true; }/* w w w. ja v a2 s .c o m*/ return false; } }