Regex Roulette · #13 · 2026-04-17
Match dates in YYYY-MM-DD format
Difficulty 3/3
How to play
Write a regex that matches all green strings and rejects all red strings. Live feedback shows which strings pass. Shorter patterns score better.
Must match
- 2024-01-15 — not yet evaluated
- 1999-12-31 — not yet evaluated
- 2000-06-01 — not yet evaluated
Must not match
- 24-01-15 — not yet evaluated
- 2024/01/15 — not yet evaluated
- 2024-1-5 — not yet evaluated
- 2024-13-01 — not yet evaluated
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Pattern body only — slashes and flags (e.g. /g, /i) aren't part of the input.
0/200 chars
Type a regex that matches all green strings and rejects all red strings · Back to hub