OBJECTIVE: Deduce the hidden regular expression from the test strings.
MATCH strings (green) must be matched by your regex.
NO MATCH strings (red) must NOT be matched.
You have 6 attempts. Each attempt shows which strings your regex handles correctly.
✓ = correct handling ✗ = incorrect handling
Type a regex pattern (without slashes). e.g. ^\d+$ or [a-z]{3}