Regex Tester

Test regular expressions live with match highlighting and capture groups. Free, private and instant.

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How to use the Regex Tester

Paste or type your input into the box above.
Choose any options you need. Results update as you type.
Copy the result with the Copy button.

About this tool

Write a JavaScript regular expression and see every match highlighted in your test string, along with numbered and named capture groups.

Regex Tester is part of ToolStack Hub's Developer Tools. It runs entirely in your browser, which keeps your data private and makes results instant. There is nothing to install, no account to create and no usage limit.

Frequently asked questions

Is the Regex Tester free?

Yes. Regex Tester is completely free with no sign-up, limits or watermarks.

Is my data private when I use the Regex Tester?

Yes. It runs in your browser, so your input is not uploaded to our servers.

Does it work on mobile?

Yes. ToolStack Hub tools work on phones, tablets and desktop browsers.

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