ENGINEERING / REGEX TRAINER
WRITE THE
DETECTION.
Practice writing actual JavaScript regex for fictional data. Test expressions against labeled examples, see false positives and misses, and unlock progressively harder DLP challenges.
01 / REGEX EXERCISES
Pattern vs. context.
Expressions are executed against local, bounded test strings only. These challenges use simplified examples; a regex alone is not a production-grade SSN or PCI classifier.
Limit: 220 characters; test strings are short. This is a learning sandbox, not a general-purpose untrusted-regex execution service.
Detection report
| Fictional sample | Expected | Detected |
|---|