You are missing a few legal semantic versions

[matentzn]

          You are missing quite a bit here: https://semver.org/

Semantic Versioning is a standard which allows versions like these:

• 1.0.0-alpha
• 1.0.0-alpha+001
• 1.0.0+20130313144700
• 1.0.0-beta+exp.sha.5114f85

I would suggest we use the official semver regex: https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string

Originally posted by @matentzn in #105 (comment)

[anitacaron]

If I add the optional point to include the CHEBI version, the date (YYYY-MM-DD) will also match this pattern, and the test to not have both will fail for all. I already tried that.

[matentzn]

What you re saying is a problem with the testing logic - not the matching. All of these semvar variants should be "allowed".. I just want to make sure that they are, independent of the CHEBI issue. right now, can you have 1.0.0-alpha+001 as the "version" part of the PURL?