Pattern
/\b[A-Z][A-Z0-9_]{2,}\b/Sample text
NODE_ENV=production API_KEY missing lowercase skipTest this pattern in the editor
Environment variables
UPPER_SNAKE names used in shells and dotenv.
Related patterns
Strong-ish password
Require length and mixed character classes (demo only).
Credit card numbers
13–19 digit groups (Luhn not validated).
Semantic versions
MAJOR.MINOR.PATCH with optional pre-release.
Git short SHA
7–40 hex characters typical of git commits.
JWT tokens
Three base64url segments separated by dots.
Base64 blobs
Longish base64 strings with optional padding.