Java tutorial
//package com.java2s; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static boolean isEmail(String strEmail) { String strPattern = "[a-zA-Z0-9][\\w\\.-]*[a-zA-Z0-9][@][\\w\\-]{1,}([.]([\\w\\-]{1,})){1,3}$"; Pattern p = Pattern.compile(strPattern); Matcher m = p.matcher(strEmail); return m.matches(); } }