'Rewriting url without a speicifc query parameter using regex

I'm trying to rewrite the URL without a specific query string

https://example.com?specialVar=xXx1x&para1=xxxx&specialVar=1234&para2=xxxxxx&specialVar=333331&para3=xxxxxx&specialVar=1233z&specialVar=1233z

I need about url to be rewritten as

https://example.com?para1=xxxx&para2=xxxxxx&para3=xxxxxx

I've tried doing this

&?specialVar=[\d|a-zA-z]*

The result is :

https://example.com?&para1=xxxx&para2=xxxxxx&para3=xxxxxx

I can't seems to figure out a way to keep only ? not ?& both.

Would much appreciate your help. Thanks!

regex

Solution 1:^[1]

Maybe this

specialVar=[\d|a-zA-z]*&?

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Solution	Source
Solution 1	Maksym