Where is my input processed?

Tool calculations and conversions run locally in your browser. Existing analytics and advertising requests are separate from input processing.

Regex Tester

Inspect JavaScript regex matches and captures in an isolated worker.

JavaScript regex. UTF-16 positions; one-second worker limit.

Expression

//gi

Flags

Global (g)Case Insensitive (i)Multiline (m)Dotall (s)

Test String

Highlighted Matches

Hello! Please contact us at [email protected] or [email protected] for more info.

Match Details (0)

Match	Index	Length	Captures
No matches found.

Developer Tools Local processing

Last reviewed: 2026-08-26 · Testing methodology

Inspect JavaScript regex matches and captures in an isolated worker.

Pattern up to 2,000 characters; text up to 100,000. Use Try example where available to see the expected shape.

Select the relevant mode or settings. Automatic tools update as you type; other tools use the labeled primary action.

Check the result against your input, then use the available copy or download action. Edits clear or recompute the result.

Disposable Web Worker with native JavaScript RegExp. Processing stays in your browser.

Inputs are processed in your browser. Analytics and advertising can make separate network requests.

One-second timeout, cancellation and at most 500 displayed matches. Indexes use UTF-16. Other regex flavors differ.

Use your target editor or runtime when exact platform behavior or a broader capability is required.

Review record: 2026-08-26. See the documented behavior and limitations above, and the testing standards for the scope of review.

What does this tool support?: Pattern up to 2,000 characters; text up to 100,000. One-second timeout, cancellation and at most 500 displayed matches. Indexes use UTF-16. Other regex flavors differ.
Where is my input processed?: Tool calculations and conversions run locally in your browser. Existing analytics and advertising requests are separate from input processing.