How to validate Email address in php in javascript?

In this tutorial learn how to validate email address in javascript, Validate Email address  in javascript, email validation using Example of valid email id

yoursite@gmail.com
your.site@donate.org
yoursite@you.net

use regular express  /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

in javascript

 Create a index.html

<form action="" method="post" accept-charset="utf-8">

<input type="hidden" name="username" value="Jack">

<input type="hidden" name="member_id" value="123">

<input type="text" name="name" value="" id="name" placeholder="Enter Name" class="hiddenname">

<br> <br><input type="text" name="email" value="" id="email" placeholder="Enter Email" class="hiddenemail" onblur="validateEmail(this);">

<br><br><input type="text" name="address" value="" id="address" placeholder="Enter address" class="address">

<br><br><input type="text" name="contact" value="" id="contact" placeholder="contact" onclick="some_function()">

<br><br><input type="submit" name="btnSubmit" value="Submit">

</form>

<script type="text/javascript">

function validateEmail(emailField){

        var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

        if (reg.test(emailField.value) == false) 

        {

            alert('Email Address is Invalid');

            return false;

        }

        return true;

}

</script>