Create a regular expression for Google Analytics, with an increasing number of sid

As a new feature in Regex, I am trying to add a specific goal in Google Analytics to track the sending of a contact form.

Can anyone advise me on how to represent the following (the presentation of the final url of the contact form) in the regular expression:

https://domain.com/node/6/done?sid=1036
https://domain.com/node/6/done?sid=1037
https://domain.com/node/6/done?sid=1038
etc

I have the following but it does not seem to work:

^ / node / 6 / done ? sid =[^&]*

Any help would be greatly appreciated! 🙂

Stephen