How can I modify script so that the form only appears on url's matching a pattern?

We want the form to only appear on pages matching pattern:

http://www.gownsbysimpleelegance.com/PROD/#####

How would we change the script to accomplish this?

You can use custom domains and custom URLs here in JotForm. Please refer to these guides:

How-to-use-Custom-Domains-with-Jotform
Example: http://forms.mycompanydomain.com/form/1234567890

How-to-Create-a-Custom-URL-of-a-Form
Example: https://www.jotform.com/username/formtitle

Hope that helps. Thank you.