How This Regex Explanation Generator Works
This isn’t just another regex tester. It’s a real-time explanation engine that runs 100% in your browser — with zero backend, zero tracking, and zero data collection.
Client-Side Parsing Engine
Every character you type is parsed instantly using a custom TypeScript regex tokenizer. It breaks down:
- Anchors (
^,$) - Quantifiers (
*,+,?,{n,m}) - Character classes (
[a-z],\d) - Groups and alternations
Each token becomes a human-readable explanation — no external APIs, no RegExp constructor tricks.
Live Updates & Progress
Thanks to Svelte’s reactivity and async parsing with progress callbacks, even 10,000-character patterns are handled smoothly with a live progress bar.
Catastrophic Backtracking Detection
Dangerous patterns like (a+)+ or (.*)* are detected instantly and flagged with a red warning — preventing browser hangs before they happen.
Flavor-Aware Parsing
Switch between JavaScript, Python, PCRE, and Java — see how the same pattern behaves differently across engines.
Share via Link
Click “Share” → your regex is Base64-encoded in the URL. Open it anywhere — it auto-loads. No server. No storage. Pure privacy.
Open Source & Deployable
Built with SvelteKit + adapter-static. Deploy to GitHub Pages in one command. Fork it, customize it, own it.
FAQ
Why not use existing libraries?
Most are heavy, server-dependent, or don’t explain. This is lightweight and educational.
Can it handle very long regexes?
Yes — with smooth progress and no freezes.
Privacy-first. Developer-first. Forever free.