[0-9]+(?:\.[0-9]+)*) # release segment
(?P # pre-release
[-_\.]?
(?P(a|b|c|rc|alpha|beta|pre|preview))
[-_\.]?
(?P[0-9]+)?
)?
(?P # post release
(?:-(?P[0-9]+))
|
(?:
[-_\.]?
(?Ppost|rev|r)
[-_\.]?
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(?P # dev release
[-_\.]?
(?Pdev)
[-_\.]?
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)?
)
(?:\+(?P[a-z0-9]+(?:[-_\.][a-z0-9]+)*))? # local version
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