Regex Lab
A downloadable game
Regex Lab is a regular expression workbench in a single HTML file: live highlighted matches, capture groups, a match list and find & replace - all running 100% locally.
Why offline matters for THIS tool specifically: people paste server logs, config dumps, customer records and API responses into online regex testers every day. That data often contains emails, IPs, tokens and PII. With Regex Lab on your desktop there is no upload endpoint at all - your samples physically cannot leave the machine.
Features:
- Live highlighting as you type (alternating colors per match)
- Capture group list for every match
- Find & replace with $1 $2 group references
- Flags: global, ignore-case, multiline, dotall, unicode
- Built-in cheat sheet: email, IPv4, quantifiers, lookarounds
- Sample log loader to practice on
- Auto-saves your last pattern and text locally
One HTML file (~10 KB). Works forever in any modern browser. No install, no account, zero telemetry.
More offline tools: pdfpockettools.itch.io
Made by pdfpockettools — also check out PDF Pocket Tools: merge, split, rotate and re-order PDF files 100% offline in one single HTML file.
Purchase
In order to download this game you must purchase it at or above the minimum price of $1.29 USD. You will get access to the following files:
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