Fix fallback regex for OpenSuse

[n-rodriguez]

See #377

This regex matches both case :

VERSION = 15.0 and
VERSION="15.0"

Thank you!

[tas50]

@n-rodriguez Can you add a comment above the regex with a permalink from rubular. https://rubular.com/

That way we can have a link in the code to show the various things we're trying to match instead of having to track things back to this PR.

Also you'll need to sign this commit off for the DCO before we can merge it. https://github.com/chef/chef/blob/master/CONTRIBUTING.md#developer-certification-of-origin-dco

[n-rodriguez]

@tas50 done! Thank you!

[robbkidd]

Seems OK with more variants: https://rubular.com/r/b5PN3hZDxa5amV

And an example for the regex appearing above it: https://rubular.com/r/UKaYWolCYFMfp1

[n-rodriguez]

@robbkidd done! thank you! 👍

[zenspider]

I dunno... should I be the anal-retentive regexp-er? I am not sure it actually matters because this is coming from some vendored source?

I'm gonna approve, but just so you know, that \s accepts things like tabs or newlines. You probably just want <space>?... and the "? allows for the quotes to be on one side and not the other. Again, probably doesn't matter, but in other contexts that sort of thing is crucial.

[n-rodriguez]

Actually [[:space:]] is an "alias" to \s : https://ruby-doc.org/core-2.6.3/Regexp.html#class-Regexp-label-Character+Classes. It has the same behavior (/[[:space:]]/ - Whitespace character ([:blank:], newline, carriage return, etc.))

[zenspider]

I meant / ?/ (added slashes so you can see the space, vs /\s?/. The first one only accepts a space.

[n-rodriguez]

I meant / ?/ (added slashes so you can see the space, vs /\s?/. The first one only accepts a space.

Ok. Do you want me to change it?

[zenspider]

I'll get it. Just consider it for next time.

[n-rodriguez]

I'll get it. Just consider it for next time.

I'll remember! Thanks!