Java tutorial
//package com.java2s; //License from project: Apache License import android.text.TextUtils; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static boolean checkEmailFormat(String email) { if (TextUtils.isEmpty(email)) { return false; } String reg = "^[0-9a-z_-][_.0-9a-z-]{0,31}@([0-9a-z][0-9a-z-]{0,30}\\.){1,4}[a-z]{2,4}$"; Pattern pattern = Pattern.compile(reg, Pattern.CASE_INSENSITIVE); Matcher matcher = pattern.matcher(email); return matcher.matches(); } }