Regex Tester & Debugger

Test JavaScript regular expressions with live matches

🔒 100 % in-browser🆓 Gratuit pour toujours⚡ Pas de signup
Note : L'interface de l'outil ci-dessous n'est actuellement disponible qu'en anglais. On traduit les UI une par une. Voir cet outil en anglais →
Flags
0 matches

Comment ça marche

  1. 1
    Enter your pattern

    Type or paste your regex in the pattern box. Pick the flags you need (g, i, m, s, u).

  2. 2
    Add test text

    Paste the string you want to test against. Matches update live.

  3. 3
    Inspect matches

    See highlighted matches, capture groups, and total match count in real time.

À propos de Regex Tester & Debugger

Free online regex tester for JavaScript regular expressions. See matches highlighted live as you type, view capture groups, test flags (g, i, m, s, u, y), and get match counts. Runs entirely in your browser - no signup, no ads inside the tool. Regex Tester & Debugger sur 712 Tools tourne entièrement dans ton browser via des APIs JavaScript natives - aucun server ne voit jamais tes données. Résultats instantanés, privacy complète, et aucune limite d'upload.

Que ce soit pour une session de debug, un sanity check rapide ou un incident en prod, cet outil est gratuit à utiliser autant que tu veux. Pas de watermarks, pas de signup et pas d'ads dans l'outil.

Questions fréquentes

Which regex flavor is this?

JavaScript (ECMAScript) - the same regex engine that runs in your browser and Node.js.

Does it support named groups?

Yes. Named capture groups like (?<year>\d{4}) are shown alongside numbered groups in the results panel.

Is my pattern or text uploaded?

No. Everything runs in your browser via the native RegExp engine.

Why is my pattern hanging?

You may have hit catastrophic backtracking - a common issue with nested quantifiers like (a+)+. Simplify the pattern.

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