Thank you, Abigail. Can you please explain how does the replacement part of your expression work? If I understand correctly, /e evaluates $1 || "$2 " -- that way if $1 is not empty, it should not add second part?
P.S. I added end-of-line processings as was suggested by aragorn
s/(\d[,.]\d)|([^\w\s](?!\s)(?!$))/$1 || "$2 "/ge;
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