Ruby pre release support

[chelnak]

Hello!

When a Ruby gem version is a pre-release it generally uses a . as the separator between major, minor, patch and the pre release info.

For example:

v1.0.0.rc.1

For more info on the expected patterns you can see https://guides.rubygems.org/patterns/#prerelease-gems.

From what I can see, NewVersion does not accept this as valid.

Given that the function stars it will take a semver-ish string and coerce it in to a valid SemVer I would have expect the above example to work.

Would you be interested in supporting this in your library?

I’d be happy to work on a PR. I’ve not properly looked but it could be as simple as updating the versionRegex.

The following matches either . Or - in group 4.

v?([0-9]+)(\.[0-9]+)?(\.[0-9]+)?((-|\.)([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?(\+([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?

Edit:

This regex works

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

Thank you for taking the time to maintain such a useful library!