🔍 Regex Tester
Test regular expressions against sample text with highlighted matches and capture groups.
👉 Use Regex Tester OnlineHow to Use Regex Tester
- Enter your regular expression and the test string.
- Enable the flags you need.
- See highlighted matches and capture groups update in real time.
Features
- Instant results — everything is processed in real time in your browser.
- 100% free — no sign-up, no paywall, no usage limits.
- Private by design — your text, files, and data never leave your device.
- Works everywhere — any modern browser on desktop, tablet, or mobile.
Why DevToolBox
DevToolBox is a collection of free online developer tools built as a pure front-end application. Everything runs locally in your browser, so your data is never uploaded to any server. No sign-up, no installation, no usage limits — just open the page and use the tool.
FAQ
Is Regex Tester free?
Yes, Regex Tester is 100% free to use — no sign-up, no subscription, and no usage limits.
Is my data uploaded?
No. Everything is processed locally in your browser, so your data is never uploaded to any server.
Do I need to install anything?
No. Regex Tester runs directly in your browser — no downloads, no plugins, and no account required.