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Regex Roulette · #33 · 2026-05-07

Match filenames ending in .js, .ts, or .jsx

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

  • app.js — not yet evaluated
  • index.ts — not yet evaluated
  • Component.jsx — not yet evaluated
  • a.js — not yet evaluated

Must not match

  • app.py — not yet evaluated
  • file.tsx — not yet evaluated
  • app.css — not yet evaluated
  • noext — not yet evaluated
  • .js — 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