Regex Help | Preg_replace is driving me crazy!

hello fellow coders. I need help with the following

am trying to use preg_replace to change an existing script on my page

PHP:

<script type="text/javascript">
                var 
ad_idzone "888888",
                    
ad_width "728",
                    
ad_height "90";
            
</script>
            <script type="text/javascript" src="https://ads.xxx.com/ads.js"></script>
            <noscript><a href="http://main.xxx.com/img-click.php?idzone=8888888" target="_blank"><img...

Regex Help | Preg_replace is driving me crazy!