Java tutorial
//package com.java2s; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static boolean isEmailFormat(String email) { boolean tag = true; final String pattern1 = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$"; final Pattern pattern = Pattern.compile(pattern1); final Matcher mat = pattern.matcher(email); if (!mat.find()) { tag = false; } return tag; } }