RegexChameleon highlights every pattern match on any webpage — instantly, beautifully, in your own colors. No copy-paste. No DevTools.
Edit the patterns below — matches highlight live in the text. Each pattern gets its own color.
From quick email scans to complex multi-rule debugging sessions.
Each regex rule gets its own color from a 10-tone palette — automatically cycled and always distinguishable at a glance.
Live nowHighlights update 300ms after your last keystroke. No click needed. Instant feedback while you craft your pattern.
Live nowInline regex parser gives you a green ✓ or a precise red error message before the pattern ever touches the page.
Live nowStack unlimited patterns. Toggle, delete, or reorder them. Your rules persist across browser sessions via chrome.storage.
Live nowNot just highlighting — swap matched text with a replacement string, preview the result live before committing.
Coming soonExport all matches as CSV or JSON. Share your pattern sets with a link. The full web app at alahay.org has you covered.
Coming soonGrab the .zip from the link above or our GitHub release.
Open chrome://extensions, enable Dev Mode, click Load unpacked.
Click the 🦎 icon, add a pattern, and watch your page transform.
Replace mode, named group highlighting, pattern library, CSV export — all in progress. Drop your email to get notified the moment they ship.
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We'll ping you the moment new features land. In the meantime, try the extension at alahay.org.