Regex Tester

The Regex Tester is a free online tool that helps you test and debug regular expressions in real-time. Write your regex pattern, test against sample text, see matches highlighted, and get detailed match information. Perfect for developers, data analysts, and anyone working with text patterns. All processing happens locally in your browser for complete privacy.

What is Regex Tester?

The Regex Tester is a powerful free online tool that helps you test and debug regular expressions in real-time. Write your regex pattern, test against sample text, see matches highlighted, and get detailed match information. Perfect for developers, data analysts, and anyone working with text patterns.

Why Use a Regex Tester?

Regular expressions are essential for text processing, data validation, and pattern matching. Our tool helps you build and test regex patterns efficiently with instant feedback and detailed match information.

Unlike other tools that only show matches, our tool provides detailed information about each match including groups, positions, and capture groups.

How to Use This Tool

Using the Regex Tester is simple and straightforward:

1. Enter Pattern: Write your regex pattern.
2. Select Flags: Choose from g (global), i (case-insensitive), m (multiline).
3. Enter Test Text: Paste the text you want to test against.
4. See Results: Matches are highlighted in real-time.
5. View Details: See detailed match information.

Key Features

• Real-time Testing: See matches as you type
• Syntax Highlighting: Colored regex pattern
• Match Highlighting: Matches highlighted in text
• Detailed Info: Match position, groups, capture groups
• Flags Support: g, i, m flags
• Quick Replace: Test replace functionality
• Copy Results: Copy match data
• Privacy First: All processing is local

Perfect For

This tool is ideal for developers, data analysts, system administrators, and anyone who works with text patterns and regular expressions.