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RapideTools

Testeur de regex

Testez vos expressions régulières en direct.

Enter a regular expression and a test string to see matches and capture groups live. Toggle the g, i, m, s and u flags. Everything runs locally in your browser using the JavaScript regex engine.

Votre saisie est traitée localement dans votre navigateur — rien n'est envoyé, stocké ni journalisé.

Ça vous a fait gagner du temps ?Offrez-moi un café

Comment ça marche

  1. 1 Type your regular expression.
  2. 2 Toggle the flags you need.
  3. 3 Paste a test string to see matches and groups.

Cas d'usage courants

  • Build and debug a pattern.
  • Check capture groups.
  • Validate input formats.
  • Learn how a regex behaves.

Questions fréquentes

Is my input sent to a server?

No. Everything runs locally in your browser — your input is never uploaded, stored or logged.

Which regex flavour is used?

JavaScript's RegExp engine, matching what runs in browsers and Node.js.

Is there an input limit?

Test text is capped at 50,000 characters to avoid slow patterns (catastrophic backtracking) freezing the page.

Is it really free?

Yes — free, with no signup and no limits.