Flake8 W605 invalid escape sequence '\.'

[jfishe]

pypandoc/pypandoc/pandoc_download.py

Line 61 in 315c6b9

regex = re.compile(r"/jgm/pandoc/releases/download/.*(?:"+processor_architecture+"|x86|mac).*\.(?:msi|deb|pkg)")

appears to contain a SyntaxError. "|x86|mac).*\.(?:msi|deb|pkg)" should be r"|x86|mac).*\.(?:msi|deb|pkg)".

E     File "/home/jdfen/dev/panvimwiki/.tox/default/.venv/lib/python3.11/site-packages/pypandoc/pandoc_download.py", line 61
E       regex = re.compile(r"/jgm/pandoc/releases/download/.*(?:"+processor_architecture+"|x86|mac).*\.(?:msi|deb|pkg)")
E                                                                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E   SyntaxError: invalid escape sequence '\.'

The error manifests when using tox-uv to run pytest; normal tox with pip does not.