Regex Roulette · #51 · 2026-05-25
Match strings with a repeated character (aa, bb, etc.)
Difficulty 2/3
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
- aardvark — not yet evaluated
- book — not yet evaluated
- hello — not yet evaluated
- committee — not yet evaluated
Must not match
- abc — not yet evaluated
- cat — not yet evaluated
- dog — not yet evaluated
- unique — 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