Regex Tester & Debugger

Test JavaScript regular expressions with live matches

🔒 100 % im Browser🆓 Für immer kostenlos⚡ Kein Signup
Hinweis: Das Tool-Interface unten ist aktuell nur auf Englisch verfügbar. Wir übersetzen die UIs Stück für Stück. Dieses Tool auf Englisch ansehen →
Flags
0 matches

So funktioniert's

  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.

Über 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 auf 712 Tools läuft komplett in deinem Browser über native JavaScript APIs - kein Server sieht je deine Daten. Das heißt: sofortige Ergebnisse, volle Privatsphäre und keine Upload-Limits.

Ob für eine Debugging-Session, einen schnellen Sanity Check oder einen Produktions-Incident - dieses Tool ist kostenlos so oft nutzbar, wie du willst. Keine Wasserzeichen, kein Signup und keine Ads im Tool selbst.

Häufige Fragen

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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