Regex Lab — Test • Match • Replace

Name: Regex Lab — Test • Match • Replace
Author: mariaiuo8362

Instant regex tester: flags, live highlights, groups, and replace preview. Works fully offline. No permissions.

As of June 2026, Regex Lab — Test • Match • Replace has 2 users in the Functionality & UI category.

mariaiuo8362 Functionality & UI

Chrome Web Store ↗.crx

Users−33.3%

Rating0%

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— reviews

Reviews0%

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Version

1.0.0

Manifest V3

History

2 snapshots

Tracking since Apr 18, 2026.

View as table

Date	Users	Rating	Reviews	Version
Apr 18, 2026	3	—	—	1.0.0
Apr 28, 2026	2	—	—	1.0.0
Now	2	—	—	1.0.0

Permissions & access

Permissions: None declared
Host access: None declared

Screenshots

Regex Lab — Test • Match • Replace screenshot 1

About

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.

MV3 & CSP-friendly: no inline scripts or remote assets.

Key features

Test patterns with live feedback and error messages for invalid regex.

Flags: toggle i g m s u y as needed.

Highlight all matches in a clean preview pane.

Matches & groups: view each match with start index, length, and captured groups.

Replace preview with $1, $2, … placeholders.

Copy highlighted HTML or replaced output instantly.

Accessible, keyboard-friendly UI with a compact “terminal” theme.

Designed for developers, QA, writers, and anyone who needs fast, privacy-first regex testing inside a simple popup.