Java tutorial
//package com.java2s; import java.util.regex.Pattern; public class Main { public static boolean mailAddressVerify(String mailAddress) { String emailExp = "^([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})(\\]?)$"; Pattern p = Pattern.compile(emailExp); return p.matcher(mailAddress).matches(); } }