Is my input sent to a server?

No. The tool runs in your browser and does not upload the values you enter.

Do I need to install anything?

No. localkit works directly in a modern web browser.

Regex Tester

Highlight regular expression matches, inspect groups, and preview replacements. Large inputs run in a Worker with a timeout for ReDoS protection.

Pattern

//g

Test Text

Match Result

Matches will appear here

Replacement preview ($1 and $<name> are supported)

0 chars

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What is Regex Tester?

Highlight regular expression matches, inspect groups, and preview replacements. Large inputs run in a Worker with a timeout for ReDoS protection.

How it works

Regex Tester runs locally in your browser. You can paste data, inspect the result immediately, and keep sensitive values off external servers.

Privacy

Input and output values are not sent to localkit servers. Browser storage is used only for interface preferences such as theme and recently used tools.

FAQ

Is my input sent to a server?: No. The tool runs in your browser and does not upload the values you enter.
Do I need to install anything?: No. localkit works directly in a modern web browser.