Regex Tester

Instantly test, match, highlight, and replace text with your regular expressions. 100% private & free.

How does this Regex Tester work?

Enter your regex pattern, flags, and test string. This tool instantly shows all matches, highlights them in your text, and shows how a replacement would look. Everything runs locally in your browser — your data stays private.

Why use a Regex Tester?

Regular expressions can be tricky. This simple tester helps developers, testers, and students quickly verify patterns, debug replacements, and learn regex syntax live — without sending data to any server.

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