Email Validation In PHP

Email address Validation in PHP   

<form> Email Address: <input type='text' name='email'> <input type='submit' value='Submit'> </form>
 
<?php
 $email=$_REQUEST['email']; 

 $expression = "^[a-z0-9_\+-]+(\.[a-z0-9_\+-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*\.([a-z]{2,4})$"; 

 if (eregi($expression, $email)) {
 echo 'Valid Email'; 

 } else { 

 echo 'Invalid Email';
 }
 ?>

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