generate link on the same page + 1 variable

Question

Tell me plz, how i can generate link on the same page with the same variables.
In my case i have some url with (?P\w+) and **kwargs and on getting page is GET form.
And in one moment I want to use link, which add variable to my view (in my case, for {% regroup %}), how i can generate this link.
If i use {% url %} i can lost request.GET dict of my form Thanks