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Regex Roulette · #34 · 2026-05-08

Match strings where every character is the same

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

  • aaa — not yet evaluated
  • bbbbb — not yet evaluated
  • x — not yet evaluated
  • 111 — not yet evaluated

Must not match

  • ab — not yet evaluated
  • aab — not yet evaluated
  • aba — 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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