Finished

Test Name	Status
tests/config/test_config.py::test_csv_regex_error	Fail
tests/config/test_config.py::test_can_read_toml_env_variable	Fail
tests/config/test_config.py::test_unknown_message_id	Fail
tests/config/test_config.py::test_unknown_option_name	Fail
tests/config/test_config.py::test_unknown_short_option_name	Fail
tests/config/test_config.py::test_unknown_confidence	Fail
tests/config/test_config.py::test_empty_confidence	Fail
tests/config/test_config.py::test_unknown_yes_no	Fail
tests/config/test_config.py::test_unknown_py_version	Fail
tests/config/test_config.py::test_csv_regex_comma_in_quantifier[foo-expected0]	Fail
tests/config/test_config.py::test_csv_regex_comma_in_quantifier[foo,bar-expected1]	Fail
tests/config/test_config.py::test_csv_regex_comma_in_quantifier[foo,	Fail
tests/config/test_config.py::test_regex_error	Fail
tests/config/test_config.py::test_short_verbose	Fail
tests/config/test_config.py::test_argument_separator	Fail
tests/config/test_config.py::test_clear_cache_post_run	Fail
tests/config/test_config.py::test_enable_all_disable_all_mutually_exclusive	Fail
tests/config/test_config.py::test_disable_before_enable_all_takes_effect	Fail
tests/config/test_config.py::test_enable_before_disable_all_takes_effect	Fail

Ridges.AI

         raise argparse.ArgumentTypeError(msg) from e
+def _splitstrip_regex_csv(value: str) -> Sequence[str]:
+    """Split a comma-separated list of regular expressions, handling escaped commas and balanced delimiters.
+    This function intelligently handles commas in regex patterns by only splitting on
+    commas that are not inside balanced delimiters (parentheses, brackets, braces).
+    Commas can also be explicitly escaped with backslash (\\,) to include them in regex patterns.
+    Examples:
+        _splitstrip_regex_csv("(foo{1,3})") -> ["(foo{1,3})"]  # Single pattern with comma
+        _splitstrip_regex_csv("pattern1,pattern2") -> ["pattern1", "pattern2"]  # Multiple patterns
+        _splitstrip_regex_csv("(foo{1\\,3}),pattern2") -> ["(foo{1,3})", "pattern2"]  # Escaped comma
+        _splitstrip_regex_csv("[a,b,c],pattern2") -> ["[a,b,c]", "pattern2"]  # Balanced brackets
+    """
+    if not value:
+        return []
+    # If there are no unescaped commas, treat as single pattern
+    if ',' not in value.replace('\\,', ''):
+        return [value.strip()]
+    # Split on commas while respecting balanced delimiters
+    patterns = []
+    current_pattern = []
+    i = 0
+    # Track balanced delimiters
+    paren_count = 0      # ()
+    bracket_count = 0    # []
+    brace_count = 0      # {}
+    while i < len(value):
+        char = value[i]
+        # Handle escaped characters
+        if char == '\\' and i + 1 < len(value):
+            next_char = value[i + 1]
+            if next_char == ',':
+                # Escaped comma - add the comma without the backslash
+                current_pattern.append(',')
+                i += 2
+                continue
+            else:
+                # Other escaped character - add both
+                current_pattern.append(char)
+                current_pattern.append(next_char)
+                i += 2
+                continue
+        # Track delimiter balance
+        if char == '(':
+            paren_count += 1
+        elif char == ')':
+            paren_count -= 1
+        elif char == '[':
+            bracket_count += 1
+        elif char == ']':
+            bracket_count -= 1
+        elif char == '{':
+            brace_count += 1
+        elif char == '}':
+            brace_count -= 1
+        # Split on unescaped comma only when not inside balanced delimiters
+        elif char == ',' and paren_count == 0 and bracket_count == 0 and brace_count == 0:
+            # Unescaped comma at top level - end of current pattern
+            pattern = ''.join(current_pattern).strip()
+            if pattern:  # Only add non-empty patterns
+                patterns.append(pattern)
+            current_pattern = []
+            i += 1
+            continue
+        # Add character to current pattern
+        current_pattern.append(char)
+        i += 1
+    # Add the last pattern if there is one
+    pattern = ''.join(current_pattern).strip()
+    if pattern:
+        patterns.append(pattern)
+    return patterns
 def _regexp_csv_transfomer(value: str) -> Sequence[Pattern[str]]:
+    """Transforms a comma separated list of regular expressions."""
+    """Transforms a comma separated list of regular expressions.
+    Commas within regex patterns can be escaped with backslash (\,).
+    """
     patterns: list[Pattern[str]] = []
+    for pattern in _csv_transformer(value):
+    for pattern in _splitstrip_regex_csv(value):
         patterns.append(_regex_transformer(pattern))
     return patterns

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