Developer tools

Regex Tester

Test a JavaScript regular expression against sample text. Nothing you enter leaves your browser.

Pattern, then --- on a line, then test text

Result

Your result will appear here.

Simple by design

Get the answer, without the clutter.

FormatCalc is built for quick work. This regex tester runs entirely on your device, so private text and data stay private.

01

Enter or paste your information.

02

Transform it with one click.

03

Copy, use, or download your result.

Common questions

Using the Regex Tester

Is the Regex Tester free to use?

Yes. FormatCalc's Regex Tester is free to use with no account required.

Is my data private when I use the Regex Tester?

Yes. This tool processes your input locally in your browser. FormatCalc does not upload or store what you enter.

How do I use the Regex Tester?

Paste or type your input, select any available options, and choose Test regex. You can then copy the result.