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Desktop App · Updated Jul 2026
regexnix
Offline desktop regex tester. Type a pattern, watch matches highlight live in your test text, read a plain-English breakdown of what the pattern does, and preview replacements — all without pasting production logs or customer data into a browser tab.
Key features
- Live pattern input with g i m s u flag pill toggles, inline syntax-error strip (red, monospace), and a JS flavor badge.
- Live match highlighting over the test text using the mirrored backdrop-overlay technique (transparent textarea layered over a metrics-matched highlight div, scroll-synced).…
- Capture groups + named groups table — the Matches panel lists each match number, value, start–end index, and every numbered/named group ($1, $<name>) with its value. Group…
- Plain-English explanation tree — an indented, color-dotted breakdown of the pattern.
- Collapsible replacement field with live output preview. Uses the native engine so $1, $<name> and $$ all work; Copy button copies the result.
- Pattern library — 25 curated entries.
- Cheat-sheet drawer — static quick reference for classes, quantifiers, anchors, groups and lookarounds.
- Runaway / ReDoS protection — see Scope notes; the app stays responsive on catastrophic patterns and never infinite-loops on zero-length matches.
First releaseJul 2026
Last updatedJul 2026
PlatformWindows
Read before you use regexnix
regexnix is experimental software shared free of charge. Using it means accepting the terms below in full. If you do not accept them, do not download or run it.
- Experimental, unfinished software
- This is a personal side project released as an experiment, not a commercial product. It may contain bugs, may behave unpredictably, may stop working after an operating system update, and may be abandoned at any time without notice or migration path.
- No warranty of any kind
- The software is provided "AS IS" and "AS AVAILABLE", without warranty of any kind, express or implied, including but not limited to the implied warranties of merchantability, fitness for a particular purpose, title, and non-infringement. No promise is made that it is accurate, reliable, secure, uninterrupted, or error-free.
- You accept all risk
- You install and run this software entirely at your own risk. Before using it, back up anything you care about. Tools that rename, move, delete, compress, encrypt, sync, or otherwise modify files can cause irreversible data loss if they behave unexpectedly or are used incorrectly.
- No liability
- To the maximum extent permitted by applicable law, NixBiz and Anand Bhandari accept no liability for any damages whatsoever — including data loss, corrupted or deleted files, lost profits, business interruption, hardware issues, security incidents, or any direct, indirect, incidental, special, consequential, or punitive damages — arising from or connected to your use of, or inability to use, this software.
- Unsigned builds and security prompts
- Builds are not code-signed. Windows SmartScreen, macOS Gatekeeper, or your antivirus may warn about or block them. Only ever download from an official NixBiz link, and verify anything you run. Never disable your security software on account of this project.
- Your data, keys, and third-party services
- These tools are designed to run locally, but some features can connect to third-party services you configure yourself. You are responsible for your own API keys, credentials, costs, and for complying with those providers' terms. Any charges you incur with a third-party provider are yours alone.
- Not for critical or regulated use
- This software is not intended for, and must not be relied on in, any safety-critical, medical, legal, financial, or otherwise regulated setting, nor anywhere failure could cause injury, loss, or legal exposure. It is not a substitute for professional advice or a supported commercial tool.
- Free, and no support promised
- The software is free to use. There is no service level agreement, no guaranteed support, no guaranteed updates, and no guaranteed compatibility with your system or with future versions.
- Your responsibilities
- You are responsible for using the software lawfully, for respecting the rights of others, and for ensuring your use complies with any policies that apply to your device, employer, or jurisdiction.
These terms sit alongside the Terms of Service and Privacy Policy. Where a project ships its own licence, that licence governs the software itself.
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