Testeur Regex

Testez des expressions régulières avec correspondance en temps réel, mise en surbrillance et prise en charge des groupes de capture. Gratuit, sans inscription.

Expression régulière

//g

Global (g)Insensible à la casse (i)Multiligne (m)Dotall (s)

Chaîne de test

À propos des expressions régulières

Les expressions régulières (regex) sont des motifs puissants utilisés pour la correspondance, la recherche et le remplacement de texte. Elles sont essentielles pour la validation de saisie, le traitement de texte et l'extraction de données. Cet outil teste votre regex en temps réel avec le moteur regex de JavaScript.

Frequently Asked Questions

What is the difference between testing and matching?

Testing checks if a pattern matches a string at all (with the "g" flag, it finds all matches). Matching shows you where in the text the pattern was found and what was captured. Use tools like JSON Formatter to validate your data before testing patterns.

What do regex flags do?

The global flag (g) finds all matches; case-insensitive (i) ignores uppercase/lowercase; multiline (m) makes ^ and $ match line boundaries instead of string boundaries; dotall (s) makes . match newlines. Combine flags as needed.

How do I match email or phone numbers?

Email: /[^@]+@[^@]+\.[^@]+/. Phone (US): /\d3-\d3-\d4/. For real production use, check the validation best practices.

What's a capture group?

Parentheses in a regex create capture groups. For example, (\w+) captures one or more word characters. Groups are shown separately in the matches list, allowing you to extract specific parts of your match.

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Comment utiliser

Enter your regex pattern in the pattern field
Add flags (g for global, i for case-insensitive, m for multiline)
Type or paste your test text
View highlighted matches and match details in real-time

Cas d'utilisation

Validating email addresses, URLs, or phone numbers
Extracting data from text (log parsing, web scraping)
Search and replace operations
Input validation in web forms

Questions fréquentes

What is a regular expression?

A regular expression (regex) is a pattern used to match, search, and manipulate text. It's supported in virtually every programming language.

How do I test my regex?

Enter your regex pattern in the pattern field, add test text below, and the tool will highlight all matches in real-time. Flags like 'g' (global) and 'i' (case-insensitive) are supported.

Is my regex data safe?

Yes. All regex processing happens in your browser using JavaScript's built-in RegExp engine. No data is sent anywhere.