Test regular expressions against sample text with live match highlighting, capture group extraction, and flag controls (global, multiline, case-insensitive). All evaluation runs client-side — no data leaves your browser.
How to Use Regex Tester
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Input your data
Paste, type, or upload your inputs into the input fields at the top of the page.
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Configure options
Adjust any available options, dropdowns, checkboxes, or parameters to customize the output.
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Get instant results
Our tool processes your input instantly completely offline. Copy the formatted results or download the generated output directly to your device.
The Technical Details
This interactive web utility is designed to provide quick, reliable, and completely private calculations and data transformations. Modern workflow requirements often call for quick format adjustments, conversions, or math estimations. By executing all logic directly in your browser using client-side JavaScript, this utility ensures that your sensitive inputs are never transmitted across the network, combining modern browser speed with absolute data confidentiality.
Frequently Asked Questions
Is my data safe and private when using Regex Tester?
Yes. All operations, conversions, and computations on Regex Tester are performed entirely in your local web browser using client-side JavaScript. None of your data is sent to our servers, logged, or shared with third parties.
How much does Regex Tester cost to use?
This utility is 100% free to use. There are no limits on usage, no subscriptions, no premium paywalls, and no registration required.
Can I use Regex Tester offline?
Yes. Once this page is loaded in your browser, all core functionalities of Regex Tester are executed client-side. You can disconnect from the internet and continue using the utility without any active network connection.