• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: macOS 11
• Poetry version: 1.2.0
• Link of a Gist with the contents of your pyproject.toml file: n/a

Issue

When using a version number such as "1!1.0.0", the wheels generated by poetry have a filename with "1_1.0.0". This causes pip install to crash with the following error:
"ERROR: Could not build wheels for *, which is required to install pyproject.toml-based projects".

I believe that the following regular expression is at fault as it replaces the ! with _: