Java tutorial
//package com.java2s; import android.text.TextUtils; import java.util.regex.Pattern; public class Main { public static boolean isEmailValid(String email) { if (TextUtils.isEmpty(email)) return false; String regex = "^([a-z0-9_\\.-]{1,50})@([\\da-z\\.-]+)\\.([a-z\\.]{2,6})$"; return Pattern.matches(regex, email); } }