Apply the regex validation to comma-separated regular expression opti…

…on values.

Co-authored-by: Pierre Sassoulas <[email protected]>

pylint/config/argument.py

@@ -112,7 +112,7 @@ def _regexp_csv_transfomer(value: str) -> Sequence[Pattern[str]]:
     """Transforms a comma separated list of regular expressions."""
     patterns: list[Pattern[str]] = []
     for pattern in _csv_transformer(value):
-        patterns.append(re.compile(pattern))
+        patterns.append(_regex_transformer(pattern))
     return patterns
 
 

tests/config/test_config.py

@@ -125,6 +125,22 @@ def test_regex_error(capsys: CaptureFixture) -> None:
     )
 
 
+def test_csv_regex_error(capsys: CaptureFixture) -> None:
+    """Check that we correctly error when an option is passed and one
+    of its comma-separated regular expressions values is an invalid regular expression.
+    """
+    with pytest.raises(SystemExit):
+        Run(
+            [str(EMPTY_MODULE), r"--bad-names-rgx=(foo{1,3})"],
+            exit=False,
+        )
+    output = capsys.readouterr()
+    assert (
+        r"Error in provided regular expression: (foo{1 beginning at index 0: missing ), unterminated subpattern"
+        in output.err
+    )
+
+
 def test_short_verbose(capsys: CaptureFixture) -> None:
     """Check that we correctly handle the -v flag."""
     Run([str(EMPTY_MODULE), "-v"], exit=False)