Cute. I don't expect any numbers larger than 4G in a version string! But, it's not case-insensitive, and doesn't validate that left and right are in the same format (you get a bogus result if they are not).
I don't know if I can use a trick like this to simplify it and still keep the error check. The check pretty much demands that each part be inspected so it can be categorized.
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