Identifiersflags: g

GitHub Actions Expression

Match `${{ expression }}` interpolations used in GitHub Actions workflow YAML.

Try it in RegexPro →

Available in

JavaScript / ECMAScript

Browser-native RegExp. Default if you don't pick.

Python (re)

CPython stdlib `re`. Unicode-aware `\w` and `\d` by default.

Go (RE2)

Linear-time matching. No backreferences or lookarounds.

Pattern

regexengine-agnostic

\$\{\{\s*([^}]+?)\s*\}\}   (flags: g)

Raw source: \$\{\{\s*([^}]+?)\s*\}\}

How it works

\$\{\{ matches the literal `${{`. \s*([^}]+?)\s* lazily captures the inner expression (with surrounding whitespace stripped). \}\} matches the closing `}}`. The lazy quantifier prevents accidentally consuming through to a later `}}` in the same line.

Examples

Input

if: ${{ github.actor == 'octocat' }}

Matches

${{ github.actor == 'octocat' }}

Input

run: echo ${{ secrets.NPM_TOKEN }} | npm publish

Matches

${{ secrets.NPM_TOKEN }}

Input

no expressions

No match

—

Common use cases

•Linting workflow files for unsafe expressions
•Detecting committed secret references
•Migrating between GitHub Actions and other CI providers
•Documentation generation from workflow YAML

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Match Git commit hashes, both short (7 chars) and full (40 chars) forms.

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