easy way to auto generate site name in url group regular expressions

I created a url group on a new blog template site


when I create a new blog I will love if there is an easy way for new blog's name to be automatically inserted in to the templatesite spot:

Eg http://mysite.com/newsite/(.*)

instead of me manually entering it each time, I have already made simple errors such as transcribing the new site name incorrectly, forgetting to change to the new site name manually for all url groups and then not properly locking down my site. It will be much easier if I can just create the url group with something like

Eg http://mysite.com/SITENAME/(.*)

and let it get inserted automatically.

Is there a simple solution for this that I am missing?