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Regex Roulette · #48 · 2026-05-22

Match exactly 3-letter words

Difficulty 1/3

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

  • cat — not yet evaluated
  • dog — not yet evaluated
  • run — not yet evaluated
  • the — not yet evaluated

Must not match

  • hi — not yet evaluated
  • cats — not yet evaluated
  • a — not yet evaluated
  • hello — 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

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