astral-sh/ruff · error · anyhow::Error

Invalid `dummy-variable-rgx` value: {e}

Error message

Invalid `dummy-variable-rgx` value: {e}

What it means

Error "Invalid `dummy-variable-rgx` value: {e}" thrown in astral-sh/ruff.

Source

Thrown at crates/ruff_workspace/src/configuration.rs:842

            preview: options.preview.map(PreviewMode::from),

            rule_selections: vec![RuleSelection {
                select: options.common.select,
                ignore,
                extend_select: options.common.extend_select.unwrap_or_default(),
                fixable: options.common.fixable,
                unfixable,
                extend_fixable: options.common.extend_fixable.unwrap_or_default(),
            }],
            extend_safe_fixes: options.common.extend_safe_fixes.unwrap_or_default(),
            extend_unsafe_fixes: options.common.extend_unsafe_fixes.unwrap_or_default(),
            allowed_confusables: options.common.allowed_confusables,
            dummy_variable_rgx: options
                .common
                .dummy_variable_rgx
                .map(|pattern| Regex::new(&pattern))
                .transpose()
                .map_err(|e| anyhow!("Invalid `dummy-variable-rgx` value: {e}"))?,
            extend_per_file_ignores: options
                .common
                .extend_per_file_ignores
                .map(|per_file_ignores| {
                    per_file_ignores
                        .into_iter()
                        .map(|(pattern, prefixes)| {
                            PerFileIgnore::new(pattern, prefixes, Some(project_root))
                        })
                        .collect()
                })
                .unwrap_or_default(),
            external: options.common.external,
            ignore_init_module_imports,
            explicit_preview_rules: options.common.explicit_preview_rules,
            per_file_ignores: options.common.per_file_ignores.map(|per_file_ignores| {
                per_file_ignores
                    .into_iter()

View on GitHub (pinned to 672bb4edf0)

When it happens

Trigger: Thrown at crates/ruff_workspace/src/configuration.rs:842 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of astral-sh/ruff@672bb4edf0 (2026-08-16). Data as JSON: /api/errors/d0feea7d352b8fa5. Report an issue: GitHub.