Regex Tester

Test patterns with highlighted matches and capture groups.

FREE - NO SIGN-UP - RUNS ON YOUR DEVICE

Runs locally in your browser

  • Liveresult
  • 0uploads
  • 1 tapto save
  • Freeno account
Specification

Regex Tester at a glance

Input
A JavaScript regular expression, flags a
Output
Highlighted matches and numbered capture
Method
The browser JavaScript RegExp engine wit
Price
Free
Where processing happens
On your device
How to

How to use Regex Tester

  1. 1

    Add your input

    Add the requested input.

  2. 2

    Choose the result

    Adjust and review the result.

  3. 3

    Copy or download

    Copy or download the result.

Questions

Frequently asked questions

Does this work without uploading anything?

Yes. The tool processes your input inside the browser tab. Nothing is sent to a processing server or stored in an account.

Can I change the result before saving it?

Yes. Adjust any available control and the result updates. Copy or download only when the output matches what you need.

Which browsers are supported?

Current versions of Chrome, Edge, Firefox and Safari support the browser features used here. Very old browsers may lack a required API.

Background

Get a clean result

Enter or choose your input and the result updates in the working area. Review the output, then copy or download it when ready.

  • Check the input format and selected options before copying or downloading.
  • Keep the original input when the output will be used in a larger workflow.

Full specification

Specification of the Regex Tester tool
InputA JavaScript regular expression, flags and test text.
OutputHighlighted matches and numbered capture groups.
MethodThe browser JavaScript RegExp engine with safe zero-length handling.
PriceFree. Supported by clearly labelled ads outside the working area.
Where processing happensIn your browser tab. Your input is never uploaded.
Next step

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