Regex-Tester

Kostenloses Online-Tool test and debug regular expressions instantly. free online regex tester with real-time matching, flags, substitution, and detailed match information. no sign-up needed.

Was ist Regex-Tester?

A powerful developer tool designed to help you work more efficiently. Regex Tester provides accurate results instantly with a clean, intuitive interface. Perfect for developers, engineers, and IT professionals.

Formel

Muster + Flags → Regexp → Execute agKInst TestText → Treffer array

häufig Musters:

- \d+ → one or more digits

- [a-zA-Z]+ → one or more letters

- ^…$ → anchors for start/end

- (…) → capture groups

Berechnung

Enter your input in the field above.
Configure any available options to customize the output.
View the results instantly with real-time updates.
Copy or export your results for use in your projects.

Beispiel

Pattern: ^[\w.-]+@[\w.-]+\.\w{2,}$ with test Text: "Contact us at hello@example.com or support@test.org" matches both email addresses and displays them in the results list.

Hauptvorteile

Get accurate results instantly in your browser.
Save time with real-time calculations as you type.
No data leaves your device - complete privacy.
Free to use on any device, no sign-up required.

Häufige Fehler vermeiden

Not escAPIng special characters (Verwendung \. instead of .)
Forgetting the g flag when expecting multiple Treffer
Verwendung gieriger Quantifizierer, wenn träge benötigt werden
Überkomplizierte Muster — einfacher ist oft besser

Professionelle Tipps

Test with both matching and non-matching Text
Verwendung online Regex references for complex Musters
Einfach beginnen und schrittweise erweitern
Verwendung named capture groups for readability

Wichtige Begriffe erklärt

Muster: Search expression
Flags: Optionen, die das Suchverhalten ändern
Treffer: Found occurrence of Muster
Erfassungsgruppe: Eingeklammerter Teil des Musters

Häufige Anwendungsfälle

Validating emKIl addresses, phone numbers, URLs
Extracting patterns from Text (dates, prices, IDs)
Search and replace operations in Text editors
Eingabe validation in web forms

Häufig gestellte Fragen

What is a Regulärer Ausdruck?

A regex is a sequence of characters defining a search pattern. It is used for pattern matching in Text, such as finding email addresses, validating input, or extracting Daten from strings.

What Regex engine does this Verwendung?

This Werkzeug uses JavaScript's built-in RegExp engine, which supports most standard regex features including groups, lookaheads, quantifiers, and character classes.

What are häufig Regex Flags?

g (global): Find all Treffer, not just first. i (case-insensitive): Ignore case. m (multiline): ^ and $ Treffer line boundaries. s (dotall): . Treffer newlines.

Why is my Regex not Treffering?

häufig issues: missing the g flag for multiple Treffer, not escAPIng special characters (., *, +, ?, [, ], (, )), or incorrect quantifier usage.

Regex-Tester

Was ist Regex-Tester?

Formel

Berechnung

Beispiel

Hauptvorteile

Häufige Fehler vermeiden

Professionelle Tipps

Wichtige Begriffe erklärt

Häufige Anwendungsfälle

Häufig gestellte Fragen

Verwandte Tools

Regex-Tester

Was ist Regex-Tester?

Formel

Berechnung

Beispiel

Hauptvorteile

Häufige Fehler vermeiden

Professionelle Tipps

Wichtige Begriffe erklärt

Häufige Anwendungsfälle

Häufig gestellte Fragen

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