Okay, I was guessing that is what it was, but that is not a v7 pattern, which is when I learned sed. The -r flag does not exist in the Mac version. These new sets of patterns are not found in bsd derived systems. I understand it is just a hack at this point. So I am debating how to best handle this. Match eol, which would work in this file for the case in question? or should I put [ ,.\t$]. At the moment I would just go for $ as it will handle this file and that is all that is needed.
Edit: Actually I had to go back to just END, but ENDING does not appear in that file so that is okay. Matching on $ doesn’t work because there is a dos line termination. This does not seem worth the effort.