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Instant regex tester: flags, live highlights, groups, and replace preview. Works fully offline. No permissions.
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Regex Lab is a lightweight, offline regular-expression tester built for clarity and speed. Enter a pattern, pick flags (i, g, m, s, u, y), paste test text, and see live highlighting, match counts, execution time, capture groups, and an optional Replace preview (supports $1, $2, …). You can copy the highlighted HTML or copy the replaced output in one click.
Why it’s safe and easy to approve
No permissions required (no tabs, no storage, no clipboard permission).
Works fully offline — nothing leaves your browser.
No site access and no content scripts; it doesn’t modify web pages.
No background tasks, no tracking, no external network requests.
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Quickly preview HTML/CSS/JS POCs with live rendering.
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