⁂Regex Tester
Test regular expressions live.
About the Regex Tester
Test and debug regular expressions against your own text, with flag support and live match highlighting. Runs in your browser. Free online regex tester and debugger.
How to use the Regex Tester
- 1Paste your input into the Regex Tester above.
- 2Configure any options for your use case.
- 3Copy the formatted or generated output.
- 4It all runs client-side, so your data never leaves the page.
Why use this tool?
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Private by design
The Regex Tester runs entirely in your browser — nothing you enter is uploaded to a server.
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Free, no signup
Use it as much as you like. There's no account, no paywall and no watermark.
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Fast & instant
Results appear the moment you type or click — no waiting, no page reloads.
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Works anywhere
Any device or browser, even offline once the page has loaded.
Frequently asked questions
Which regex flavour is used?＋
JavaScript regular expressions, with support for flags like i (ignore case) and g (global). Matches are highlighted live.