How to make an query parameter optional in regex?

@giovanny.lueilwitz 

To make a query parameter optional in a regular expression, you can use the question mark (?) symbol after the parameter you want to make optional. Here is an example:

Let's say you have a URL pattern that includes a query parameter "page":

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^https://example.com/path?page=d+$

To make the "page" parameter optional, you can add the question mark after the parameter:

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^https://example.com/path(?page=d+)?$

This will match URLs with or without the "page" parameter attached.