--ignore-paths and escaping of regex special characters

[stanislavlevin]

Bug description

It's impossible to escape special regex characters in option --ignore-paths for unix paths.

The basic example is how to escape the dot (.).

(pylint) [builder@localhost test]$ python -m pylint --recursive=y --ignore-paths='^\.tox/.*' .
> /usr/src/pyproject_installer/.tox/pylint/lib/python3/site-packages/pylint/config/argument.py(115)_regexp_paths_csv_transfomer()
-> patterns.append(
(Pdb) pattern
'^\\.tox/.*'
(Pdb) l
110     def _regexp_paths_csv_transfomer(value: str) -> Sequence[Pattern[str]]:
111         """Transforms a comma separated list of regular expressions paths."""
112         patterns: list[Pattern[str]] = []
113         breakpoint()
114         for pattern in _csv_transformer(value):
115  ->         patterns.append(
116                 re.compile(
117                     str(pathlib.PureWindowsPath(pattern)).replace("\\", "\\\\")
118                     + "|"
119                     + pathlib.PureWindowsPath(pattern).as_posix()
120                 )
(Pdb) pathlib.PureWindowsPath(pattern).as_posix()
'^/.tox/.*'
(Pdb) pathlib.PureWindowsPath(pattern)
PureWindowsPath('^/.tox/.*')

Thereby, assumption regex pattern => PureWindowsPath => regex pattern is wrong and who knows where it will shoot.

Configuration

No response

Command used

mkdir .tox && echo 'import bar' > .tox/foo.py
python -m pylint --recursive=y --ignore-paths='^\.tox/.*' .

Pylint output

(pylint) [builder@localhost test]$ python -m pylint --recursive=y --ignore-paths='^\.tox/.*' .
************* Module foo
.tox/foo.py:1:0: C0114: Missing module docstring (missing-module-docstring)
.tox/foo.py:1:0: C0104: Disallowed name "foo" (disallowed-name)
.tox/foo.py:1:0: E0401: Unable to import 'bar' (import-error)
.tox/foo.py:1:0: W0611: Unused import bar (unused-import)

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Expected behavior

According to documentation:

--ignore-paths
Add files or directories matching the regex patterns to the ignore-list. The regex matches against paths and can be in Posix or Windows format.

Actually used regex should conform to the passed one and content of .tox should be ignored.
Note: it works if the escaping is dropped:
python -m pylint --recursive=y --ignore-paths='^.tox/.*' .

Pylint version

pylint 2.14.4
astroid 2.11.6
Python 3.10.5 (main, Jun 16 2022, 17:15:02) [GCC 12.1.1 20220518 (ALT Sisyphus 12.1.1-alt1)]

OS / Environment

ALTLinux

Additional dependencies

No response

[DanielNoord]

Closing as duplicate of #5398. We welcome any suggestions to allow both Windows as Unix paths as well as allowing \ to be used as escape character.