no-invalid-template-file-pattern-regex

Rule catalog ID: R059

Targeted pattern scope

filePatterns entries in workflow-template properties metadata.

What this rule reports

Reports regex strings that are syntactically invalid.

Why this rule exists

Invalid regex values break template recommendation matching.

❌ Incorrect

{ "filePatterns": ["(package.json$"] }

✅ Correct

{ "filePatterns": ["package.json$", "^go\\.mod$"] }

Additional examples

For larger repositories, this rule is often enabled together with one of the published presets so violations are caught in pull requests before workflow changes are merged.

ESLint flat config example

import githubActions from "eslint-plugin-github-actions-2";

export default [
  {
    files: ["**/*.{yml,yaml}"],
    plugins: {
      "github-actions": githubActions,
    },
    rules: {
      "github-actions/no-invalid-template-file-pattern-regex": "error",
    },
  },
];

When not to use it

You can disable this rule when its policy does not match your repository standards, or when equivalent enforcement is already handled by another policy tool.

Targeted pattern scope​

What this rule reports​

Why this rule exists​

❌ Incorrect​

✅ Correct​

Additional examples​

ESLint flat config example​

When not to use it​

Further reading​