How do I need to whitelist a link with regular expression of alphanumeric query parameter in the firebase console

[vineelk8]

Hi, I need to add a URL pattern in the firebase console for dynamic link generation. My requirement is while generating the short link using the REST API method I'm adding a deep link with dynamic userID generated and attached as a query parameter at the last of the deep link.

I need to whitelist with an alphanumeric. How do I need to add a regular expression which allows alphanumeric?

Example:

https://www.example.com?userId=5f7330w6b347150004351f529