[Answer]-Possible to use url parameters in URL pattern?

You can’t, I’m afraid. The query string is stripped from the URL before any of the regex in your urlconf is matched.

I think your going to have to process the string in your view.

if 'a' in request.GET:
    if request.GET['a'] == 'upload':
        #...
    elif request.GET['a'] == 'gettriplist':
        #...