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Regex Tester
Test and debug regular expressions against sample text in real time, with match highlighting and group capture details.
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Frequently Asked Questions
Regex Tester is a free online tool that helps you test and debug regular expressions against sample text in real time, with match highlighting and group capture details. It runs entirely in your browser — no sign-up or installation required.
Yes, Regex Tester is completely free. There are no hidden charges, subscriptions, or account requirements. You can use it as many times as you like.
Regex Tester uses industry-standard algorithms and formulas to ensure accurate results. All calculations are performed locally in your browser for speed and privacy. If you spot an issue, please let us know via the Contact page.