incomplete regex install when using uv (linux and macos)

[ssbarnea]

Apparently if anyone is trying to install regex library using uv, they might get a broken setup:

> uv pip install regex==2024.9.11
> python3 -c "import regex._regex as _regex"
ModuleNotFoundError: No module named 'regex._regex'

> uv pip uninstall regex
> pip install regex==2024.9.11
> python3 -c "import regex._regex as _regex"
success

While installation succeeds, it does not install it properly, thus breaking it usage.

I suspect that this might have something to do with the archaic use of setup.py, which would be sorted by adopting https://peps.python.org/pep-0517/

Context: MacOS arm64 machine, python 3.12. I tried the same on Linux (ubuntu) arm64 with python 3.12 and I did not get the same error, thus it might be specific to macos.

Test results on MacoS arm64 with pythons installed using asdf:

• python3.13t broken, fail to import
• python3.13 broken, fail to import
• python3.12 broken, fail to import
• python3.11 broken, fail to import
• python3.10 works!

Seem related to #413