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Regex Tester Online

Test and debug Regular Expressions with real-time match highlighting.

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Select or Drop Regex Tester File

Files are processed 100% locally in your web browser. Zero server uploads.

What is the Regex Tester?

Test RegEx patterns with flag toggles (g, i, m, s), match indexes, and capture groups.

Why Use This Tool: Writing and debugging complex regex patterns against test strings with live match verification.

Designed For: Full-stack engineers, frontend developers, DevOps engineers, backend architects, and API testers.

Key Features of Regex Tester

✓Live match highlighting with captured group breakdown
✓Toggle regex flags (g, i, m, s, u)
✓Common regex cheat sheet and presets
✓Instant feedback without lag

How to Use the Regex Tester Online

  1. Enter Regex pattern and flags.
  2. Type test text.
  3. View match highlights and groups in real time.

Privacy & Technical Specifications

100% Client-Side.

Output Format: Live Matches Table

Processing Engine: 100% Client-Side (In-Browser)

Maximum File Size: 10 MB

Server Storage: None (Zero file upload, processed in local memory)

Frequently Asked Questions about Regex Tester

How does the Regex Tester work?

Paste your raw code or data payload into the input editor. The tool parses, processes, and highlights your data in real time directly within your web browser.

Are my files or data uploaded to a remote server?

No. Toolketly operates 100% client-side in your web browser using modern WebAssembly, JavaScript, and HTML5 Canvas engines. Your private documents, images, and data never leave your computer or phone.

Is the Regex Tester completely free to use?

Yes, this tool is 100% free with no registration, no email signup, no subscriptions, and no hidden watermarks added to your files.

What file formats and sizes are supported?

This tool supports Regex & Test text input files and exports in Live Matches Table format. Processing runs locally in your device memory up to 10 MB.

Can I use this Regex Tester on mobile devices?

Yes! Toolketly is fully responsive and functions seamlessly across all modern browsers on iOS, Android, macOS, Windows, and Linux without requiring any app or software installation.

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