dev-cmd/extract: trim version to only digits/decimals for class & file names

[EricFromCanada]

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When generating a class name for a formula, remove any non-digit characters following the @ if present. Allows a command like brew extract --version to handle versions that don't start with digits. Fixes #16881.

brew(main):001> Formulary.class_s("[email protected]")
=> "MinioAT20240305t044844z"

[Bo98]

[email protected]

Should brew extract be outputting these names at all? There's a few places that assume numerical @ versions:

brew/Library/Homebrew/formula.rb

Lines 513 to 516 in 30e2ae1

	name_prefix = name.gsub(/(@[\d.]+)?$/, "")
	T.must(tap).prefix_to_versioned_formulae_names.fetch(name_prefix, [])
	elsif path.exist?
	Pathname.glob(path.to_s.gsub(/(@[\d.]+)?\.rb$/, "@*.rb"))

[EricFromCanada]

Good point. I've updated this to have extract convert versions to just digits with decimals.

Now, RELEASE.2024-03-05T04-48-44Z becomes [email protected] with class name MinioAT20240305044844.

[Bo98]

Thanks!

[MikeMcQuaid]

Looks good with suggestions applied, thanks @EricFromCanada!

[MikeMcQuaid]

Thanks @EricFromCanada!