A fast, free regex tester that works offline

Quick one: if you need a regex tester, here's a free one that loads instantly
and works without an account — Regex Tester.

Using it

1. Open Regex Tester.
2. JavaScript RegExp tester — inline match highlighting, capture groups, token explanation.
3. Copy the result. Done — no signup, no upsell.

Because it's a single self-contained page, you can save it and use it
offline (handy on planes / locked-down networks). And since it's all
client-side, your input never leaves the tab — verify in DevTools → Network.

Part of platotools.com, a growing set of no-nonsense browser-side tools. If you
find a case it handles badly, tell me — I'd like to fix it.