At the moment in my searchbar there's a combobox with two choices (category1 and category2). When I execute my search the URL looks like this:

page.xsp?search=search_query&option=category1

Is it possible to modify the URL parameter that it returns only one URL parameter depending on the choice in the combobox with the value of the search_query, like this:

page.xsp?category1=search_query or
page.xsp?category2=search_query