About Regexflux
A modern regex toolkit for developers, by developers.
What is Regexflux?
Regexflux is a free, browser-based regex testing and exploration tool designed to eliminate the trial-and-error cycle of writing regular expressions. Type a pattern, paste your test data, and see matches highlighted instantly — with every token explained in plain English, capture groups color-coded, and ready-to-use code snippets generated for multiple programming languages.
All regex execution happens entirely in your browser using a Web Worker. Your patterns and test strings are never sent to a server, never stored, and never shared — unless you choose to generate a share link.
Who is it for?
Regexflux is built for anyone who works with regular expressions:
- Junior and mid-level developers writing form validation, input parsing, or data extraction logic
- Data analysts cleaning messy datasets with pattern-based transformations
- DevOps engineers parsing log files, writing monitoring rules, or building CI/CD pipelines
- Students learning regular expressions for the first time through our interactive lessons
Key Features
- Real-time match highlighting — matches update as you type, with no page reload or submit button
- Token-level explanations — every part of your regex is explained in plain English
- Capture group visualization — groups are color-coded with an accessible palette designed for color vision deficiency
- Code generation — copy-paste snippets for JavaScript, Python, Go, Java, PHP, Ruby, and C#
- ReDoS detection — automatic warnings for patterns vulnerable to catastrophic backtracking
- 80+ curated patterns — a searchable pattern library covering email, URL, date, phone, IP address, and dozens more
- Interactive tutorials — learn regex from scratch with hands-on exercises and lessons
- Shareable links — encode your pattern and test data in a URL to share with teammates
Privacy and Trust
Regexflux has no user accounts, no login, and no server-side processing of your data. Regex matching runs in a sandboxed Web Worker in your browser with a 5-second timeout to prevent runaway patterns. Pattern history is stored in your browser's localStorage and never leaves your device. Read our full privacy policy for details.
Built by Edison Forge
Regexflux is built and maintained by Edison Forge, based in Beaverton, Oregon. We build focused developer tools that prioritize speed, clarity, and privacy.
Have feedback, found a bug, or want to suggest a feature? We'd love to hear from you — reach out through our contact page.