Regex Roulette · #55 · 2026-05-29
Match US phone numbers (xxx-xxx-xxxx)
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
- 555-123-4567 — not yet evaluated
- 800-555-0100 — not yet evaluated
- 212-867-5309 — not yet evaluated
Must not match
- 5551234567 — not yet evaluated
- 555-12-4567 — not yet evaluated
- 55-123-4567 — not yet evaluated
- abc-def-ghij — 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