Regex Roulette · #64 · 2026-06-07
Match strings with no whitespace
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
- hello — not yet evaluated
- no-spaces — not yet evaluated
- abc123 — not yet evaluated
- test! — not yet evaluated
Must not match
- hello world — not yet evaluated
- has space — not yet evaluated
- tab here — not yet evaluated
- leading — 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