GitHub Actions Expression in PY
Match `${{ expression }}` interpolations used in GitHub Actions workflow YAML.
Try it in the PY tester →Pattern
regexPY
\$\{\{\s*([^}]+?)\s*\}\} (flags: g)Python (re) code
pyPython
import re
pattern = re.compile(r"\$\{\{\s*([^}]+?)\s*\}\}")
input_text = "if: ${{ github.actor == 'octocat' }}"
for m in pattern.finditer(input_text):
print(m.group(0))Stdlib `re` module — no third-party dependency. Works on Python 3.6+.
How the pattern works
\$\{\{ matches the literal `${{`. \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 publishMatches
${{ secrets.NPM_TOKEN }}
Input
no expressionsNo match
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