PHP Code

Question

Hi everyone 

I have this code and i want to validate the email :

it will always gives Internal Server error 

help me please in this code :

   <?php 

      

              /* send the submitted data */ 

    

    $name=$_REQUEST['name']; 

    $email=$_REQUEST['email']; 

    $error_message = "";

    $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';

    $message=$_REQUEST['message']; 

    if (($name=="")||($email=="")||($message=="")) 

        { 

        echo "All fields are required, please fill <a href=\"\">the form</a> again."; 

        } 

    elseif

     (!preg_match($email_$_REQUEST['email'])) 

     {

     $error_message .= 'The Email Address you entered does not appear to be valid.<br />';

     }

    else {

        $from="From: $name<$email>\r\nReturn-path: $email"; 

        $subject="Message sent using your contact form"; 

        mail("[email protected]", $subject, $message, $from); 

        echo "Email sent!"; 

         } 

       

?>