Is there a reason that we're not using the regex from [semver](https://semver.org/)?

[grokspawn]

Is there a reason that we're not using the regex from semver?
here:

"([0-9]+)\.([0-9]+)\.([0-9]+)(?:-([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?(?:\+[0-9A-Za-z-]+)?$"

there:

"^(0|[1-9]\d*).(0|[1-9]\d*).(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-])(?:.(?:0|[1-9]\d|\d*[a-zA-Z-][0-9a-zA-Z-]))))?(?:+([0-9a-zA-Z-]+(?:.[0-9a-zA-Z-]+)*))?$"

This one does not work for prerelease versions, right?

I realize that this PR is just moving this functionality, but I'm wondering if we need another PR to handle prerelease versioning in the checker. This question should in no way hold up this PR.

Originally posted by @grokspawn in #238 (comment)

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