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Regex Tester

Test regular expressions against sample text with live match highlighting.

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Questions answered

Frequently asked questions

Everything you might be wondering about the Regex Tester.

Which regex flavor does this use?
JavaScript's native regex engine (ECMAScript) — the same one used in browsers and Node.js.
Can I test replacements too?
This tool focuses on match testing and highlighting. For find-and-replace, use it alongside your code editor once the pattern is confirmed.
Is it free and private?
Yes — free, no sign-up, and everything runs in your browser.
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