How do you match more than one pattern in vbscript?

Set regEx = New RegExp

regEx.Pattern = "[?&]cat=[\w-]+" & "[?&]subcat=[\w-]+" // tried this
regEx.Pattern = "([?&]cat=[\w-]+)([?&]subcat=[\w-]+)" // and this

param = regEx.Replace(param, "")

I want to replace any parameter called cat or subcat in a string called param with nothing.

For instance

string?cat=meow&subcat=purr or string?cat=meow&dog=bark&subcat=purr

I would want to remove cat=meow and subcat=purr from each string.