Improve coverage regex pytest-cov (Python)

Problem to solve

Test coverage documentation currently suggests a regex for pytest-cov (Python) which is not so tight and might accidentally catch/accept wrong values. Furthermore it does not work for some scenarios.

https://docs.gitlab.com/ee/user/project/merge_requests/test_coverage_visualization.html#python-example

Further details

Currently the following regex is suggested

coverage: '/TOTAL.*\s([.\d]+)%/'

This regex also catches faulty percentages, e.g. TOTAL 1337.4242.42.42.% would be accepted, capturing 1337.4242.42.42.%

Other issues arise when setting coverage --cov-fail-under and --cov-report parameters. As discussed in e.g. just-ci/templates!54 (comment 942401999)

Proposal

To catch above mentioned issues and ensure that the percentage is always valid (and within the 0-100%) range with support for an arbitrary precision I suggest the following regex

coverage: '/(?i)total.*? (100(?:\.0+)?\%|[1-9]?\d(?:\.\d+)?\%)$/'

Who can address the issue

Other links/references