Java tutorial
//package com.java2s; import java.util.regex.Pattern; public class Main { private final static Pattern EMAILER = Pattern.compile("\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*"); public static boolean isEmail(String email) { if (email == null || email.trim().length() == 0) return false; return EMAILER.matcher(email).matches(); } }