Pipenv install parsing wrong package name

Issue description

After the latest patch for the incompatibility problem with pip 18.1, the pipenv parsing of the package name during installation no longer is working (it’s replacing . in the package name for a - and this leads to pip not finding the available versions).

This happens with pip 18.1 as well as 18.0.

Expected result

pipenv install zope.interface==4.5.0 should install from this package https://pypi.org/project/zope.interface/

Actual result

Instead it translates to zope-interface==4.5.0 and then it don’t find the package:

Could not find a version that satisfies the requirement zope-interface==4.5.0 (from versions: 4.4.0, 4.4.1, 4.4.2, 4.4.3)
No matching distribution found for zope-interface==4.5.0

Steps to replicate

create new virtualenv with latest pipenv version (2018.10.9) to see it break, and test it with the previews one (2018.7.1) where it’s still ok.

obs: I’m not sure if this is a bug in pip or pypi (not finding the correct version when replacing . with -), but since it started happening with the latest pipenv release then I believe it is actually related to pipenv.

[xocasdashdash]

Another package is dogpile.cache (Related issue: https://github.com/pypa/pipenv/issues/2959)

[HAnthonyHoyt]

This bug is actually adversely affecting me in a major way. I’ve had to update a ton of continuous integration jobs to reference the previous version to prevent this bug from failing all my deploys and deliveries. Please release a fix for this soon.