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ProgrammerKit

Regex Tester

Test JavaScript regular expressions with live highlighting.

Free · Runs in your browser · Last updated

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Flags: g i m s u y

Matches & groups

About this tool

Build and test regular expressions in real time. Supports all JS regex flags, highlights every match and lists capture groups.

Privacy

All processing for Regex Tester happens locally inside your browser using JavaScript. Your input is never uploaded to a server, logged, or shared with third parties.

Frequently asked questions

Is the Regex Tester free to use?

Yes. Regex Tester is completely free for both personal and commercial projects. There are no usage limits, no sign-up, and no premium tier.

Is my data safe when I use Regex Tester?

All processing happens locally in your browser using JavaScript. Your input is never uploaded to our servers, logged, or shared with any third party.

Does Regex Tester work offline?

Once the page has loaded, the tool runs entirely client-side. You can disconnect from the internet and it will keep working in the same browser tab.

Which browsers are supported?

Regex Tester works in all modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, Brave, and Opera, on desktop and mobile.

Do I need to install anything?

No. Regex Tester runs in any modern web browser with no installation, browser extension, or account required.

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