Thanks for the documentation link.
That certainly has a lot more text than I found where I was previously looking: and no "TODO"s in sight.
I have a bit of reading ahead of me.
Yes, I was aware of why I was getting two \037 characters at the end (in the first solution).
What I haven't figured out yet is why I was getting zero \037 characters at the end (when I changed ',?' to '(?:,|\000)' — in the second solution).
Thanks also for the additional feedback: much appreciated.
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