Toolsly
Tester

Regex Tester

Type a regex pattern and flags, paste some test text, and instantly see every match with its index and captured groups. Optionally supply a replacement string to preview what String.replace would produce. Compiled with the standard JavaScript RegExp engine and run entirely in your browser.

Privacy

Runs entirely in your browser — nothing is sent to any server.

Cost

Free. No sign-up, no watermark.

Type

Tester

Related tools

Tools that work with the same formats — most users open one of these next.

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File to Hex Dump

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Hex to Binary File

Parse a hex dump or hex string back into a binary file — strips offsets, ASCII columns, prefixes and separators automatically.

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Generate a QR code that contains a digital business card (vCard) — scanning it lets the phone save the contact in one tap.

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Frequently asked

Is Regex Tester free to use?

Yes. Regex Tester is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.

Do my files and data stay private?

Yes — Regex Tester runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.

How does Regex Tester work?

Open Regex Tester, paste or fill in the input fields, and the result updates instantly. Everything runs in your browser — no upload, no waiting.

Which browsers does Regex Tester support?

Any modern browser works — Chrome, Firefox, Safari, and Edge on desktop and mobile. Regex Tester uses standard web APIs and does not require any plugin, extension, or sign-up.