match: make the FLAG_RE pattern a raw string
PyCharm was complaining about invalid escape sequences since this was added
recently in 3eda36e9b3d6.
This directory is meant to cache artifacts useful for tests (such as bundle).
Those artifacts need to be cached because they are slow to regenerate on each
test but too large to be tracked within the repository. They are not expected
to change between each run and can be cached.
The `./scripts/` contains code to generate the artifact while the `cache`
directory contains resulting artifact.