Untitled

<html>
    <head>
        <title>Using regex</title>
        <script>
            function validate(event) {
                event.preventDefault();
                var email = document.getElementById("email").value;
                var regexemail=/[a-zA-Z0-9]+[@]+\w+[.]+\w{3}$/
                var result=regexemail.test(email);
                if(!result) {
                    alert("Email is not valid");
                } else {
                    alert("Email is valid");
                }
            }
        </script>
    </head>
    <body>
        <form onsubmit="validate(event)">
            <input type="text" id="email" onChange="" />
            <input type="submit" value="check" />
        </form>
    </body>
</html>