How to isolate and recover a word in a query using regex javascript ?

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Javascript

React

Example :

I have a query :

?keyword=word&personcapacity=2

I need to recover this "word" by deleting ?keyword= and &personcapacity=2

but this word changes depending on the search performed

Do you think that a Regex in JS can be used ?

What I have tried:

I tried this but it does not work :

^[\?-z]{8}[\s-z]{8}