Regex Tester

Test JavaScript regular expressions with live highlighting. Free, private and runs in your browser.

New
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Highlighted matches
Replace result
Common patterns

About the Regex Tester

Build and debug regular expressions with instant feedback: highlighted matches, capture groups and replacement preview.

100% free
No signup
Private – runs locally
Works on mobile

How to use the Regex Tester

  1. Enter a pattern and flags.
  2. Paste test text.
  3. Review matches and groups.

Frequently asked questions

Which regex flavor is used?

JavaScript (ECMAScript), which is very close to PCRE for most patterns.

Is the Regex Tester free?

Yes. Regex Tester on Tooliphy is 100% free with no signup, no watermark and no usage limits.

Is it safe to use? Are my files uploaded?

Your data is processed directly in your browser and is never uploaded to our servers, so it stays completely private.

Does it work on mobile?

Yes, the tool works on Android phones, iPhones, tablets and desktops in any modern browser.

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