How do I test a regular expression online?

Enter your regex pattern and test string into ZapFile's Regex Tester. It instantly highlights all matches and shows captured groups.

What regex flavors does ZapFile support?

ZapFile's Regex Tester uses JavaScript's built-in regular expression engine, supporting standard regex syntax including lookaheads, capture groups, and all common flags.

Yes, all ZapFile tools are completely free with no hidden costs or subscriptions.

Absolutely. All processing happens directly in your browser. Your files are never uploaded to any server.

Do I need to create an account?

No. ZapFile requires no registration, login, or account creation.

Does this tool work offline?

Most tools work offline after the first load. ZapFile is a Progressive Web App you can install.

Can I use this on mobile?

Yes! All tools are fully responsive and work on mobile devices.

Home/Tools/Regex Tester

🔍

Regex Tester

Test and debug regular expressions with live matching

Your files never leave your browser

Pattern

Flags:gglobalicase-insensitivemmultilinesdotall

Common Patterns

Test String

Runs on your device, not our servers

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