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Regex Tester

Test JavaScript regular expressions in a time-limited browser worker.

Testing & Layout workspaceProcessing stays in your browser; regex runs in a time-limited worker.

JavaScript pattern (without slashes)Flags

Test text (maximum 10,000 characters)

Worker processing stops after 500 ms; a maximum of 100 matches is displayed. Some complex patterns can still briefly use CPU.

Result report

Privacy-focused processingBrowser processing is used wherever practical.

25-minute cleanup policyServer files, when required, are removed after completion—not during active work.

Text, pasted data or supported local filesMaximum size and exact support are shown inside the tool.

About This Tool

Test a JavaScript regular expression against local text in a time-limited worker.

Everyday work

Complete repetitive formatting or calculation tasks.

Publishing

Prepare clean output for websites and documents.

Local review

Inspect and verify your result before downloading.

Text, pasted data or supported local files

Can complex patterns freeze the page?

The tester terminates its worker after a short time limit, though an intensive run may briefly use browser CPU.

Local first

Supported processing runs inside your browser whenever practical.

Temporary files

When server processing is required, cleanup starts only after the work completes.

Your responsibility

Avoid uploading confidential data unless you understand the displayed processing notice.