Thanks for your response. I have opened a PR at [1] that would remove the re.escape such that the implementation matches the documentation if you decide that this is fine.

[1]: https://github.com/python/cpython/pull/9358

Personally, I would go even further and always add the `(\..*)?$` suffix (instead of only `$`) to make it easier to match all modules in a package which is probably the most important use-case for the case of packages. What do you think?