Java tutorial
//package com.java2s; import java.util.regex.Pattern; public class Main { public static boolean isEmail(String email) { String emailPattern = "[a-zA-Z0-9][a-zA-Z0-9._-]{2,16}[a-zA-Z0-9]@[a-zA-Z0-9]+.[a-zA-Z0-9]+"; boolean result = Pattern.matches(emailPattern, email); return result; } }