Help me fix Python Regular expression line

I have a 32 line program that finds repeated license keys. It works fine. I want to add a line that makes sure that any line that is not a license key is discarded. I am therefore trying to write a regular expression something like this pat=[login to view URL]('([A-Z0-9]{4}-A-Z0-9]{4}-A-Z0-9]{4}-A-Z0-9]{4}') e.g. 2YKH-G73D-WGTE-D2UR if [login to view URL] (pat,i) m=[login to view URL](pat,i) key_dict[m]=None so the program will have only one or two lines more than the original