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Regex Tester

Generators

Test and debug regular expressions with real-time matching. Free, private — all processing in your browser.

Regular Expression

Presets:

Test String

How to use

1. Enter or paste your data in the input area above
2. Adjust settings or options as needed
3. Click the action button or see real-time results
4. Copy the result with the copy button

All processing happens in your browser. Nothing is sent to any server.

About this tool

Regular expressions (regex) are patterns used to match character combinations in strings. Our Regex Tester lets you write patterns and test them against sample text in real-time, showing all matches with their positions, capture groups, and named groups. The tool includes a built-in cheatsheet with clickable patterns, 6 preset patterns for common use cases (email, URL, IP address, phone number, hex color, date), flag toggles for global, multiline, case-insensitive, and dotall modes, and a replace mode that supports group references ($1, $2). Whether you are validating form inputs, extracting data from text, or building search-and-replace operations, this regex tester gives you instant feedback as you type. All processing uses your browser native RegExp engine — no server calls, no data collection.