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Regex Tester

Test and debug regular expressions in real-time with match highlighting, group capture and flags support.

100% Private Browser-Based Free Forever New Tool

const tool = {
  name: 'Regex Tester',
  type: 'browser-based',
  cost: free,
  privacy: true,
}

Regex Tester

Test and debug regular expressions in real-time with match highlighting, group capture and flags support.

Full UI launching soon

Want early access? Let us know →

How to Use Regex Tester

Enter your regex pattern

Type test string and matches highlight live

Inspect captured groups in the panel below

Why Use This Tool

100% Private

Your data never leaves your browser. Nothing is uploaded to any server.

Instant Results

Modern browser APIs deliver results in milliseconds with no waiting.

Free Forever

No subscriptions, no credits, no paywalls — ever.

Frequently Asked Questions

What regex flavour is used?

JavaScript RegExp — works natively in the browser.

Are regex flags supported?

Yes — g, i, m, s and u flags are all supported.

Can I test named capture groups?

Yes — named groups appear labelled in the match details panel.

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