SELinux – Invalid Regex in /etc/selinux/targeted/contexts/files/file_context

So I have been doing my best to better understand SELinux as of late, and last night when I was practicing I ran into an issue that had me banging my head against by desk. Specifically I was playing around with the semanage command and working on defining a particular context to a directory that I had just created. However I was not exactly quite sure of the exact regex to use (or even if I needed to use a regex)