can i skip a particular path from doFilter

Hi,
I have a filter to my application url which redirects the user to the login page if it does not find a valid user in the Principle, but on the login page i have a register button which when clicked, i want to skip a particular path of my application so that i can display the user registeration form without the user being validated first. How can i do that by using the doFilter method. Thank you in advance.
Regards
Saurabh