pathlib.Path.glob() converts a given string pattern to a Path object:

Which has the following drawbacks:

• It instantiates a Path object, which is slow
• It normalizes a Windows UNC drive if given, which is unnecessary - any anchor causes NotImplementedError to be raised.
• It strips the trailing slash from the pattern, so we need to peek at pattern._raw_path to restore it

It would be better to add a variant of PurePath._parse_path() for dealing specifically with glob patterns.

Linked PRs

• GH-126363: Speed up pattern parsing in pathlib.Path.glob() #126364