Fatle Error: FILTER_VALIDATE_EMAIL

["Mark Abrams" <mark@xxxxxxxxxxxxxxxxxxxxxxxx>]

OS: XP Pro
PHP Version 5.1.2


I trying to use PHP filters (http://www.w3schools.com/php/php_filter.asp) 
which are supposted to come installed as part of the PHP core.
On three servers running v5.1.2 I recieve: Fatal error: Call to undefined 
function: filter_var() in ...


Is there something in the php.ini that needs to be enabled?
TIA
Mark



<?php
 $email = "someone@exa mple.com";if(!filter_var($email, 
FILTER_VALIDATE_EMAIL))
 {
 echo "E-mail is not valid";
 }
else
 {
 echo "E-mail is valid";
 }

 ?> 

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