Regex Tester & Visualizer

Test, debug, and visualize your Regular Expressions against custom text.

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Introduction

What is Regex Tester & Visualizer and How Does It Work?

Test, debug, and visualize your Regular Expressions against custom text.

Here are some of the primary reasons developers use this tool:

  • Ensure your regex correctly matches desired patterns.
  • Identify capturing groups and match indices.
  • Debug complex Lookaheads and Lookbehinds.

Step-by-Step Guide: How to Use Regex Tester

  1. Enter your regular expression and flags (e.g., /g, /i).
  2. Paste the test string.
  3. Matches and capturing groups are highlighted in real-time.
  4. View detailed match data in the sidebar.

Key Features & Privacy Guarantees

  • Supports JavaScript (ECMAScript) regex engine
  • Real-time syntax highlighting
  • Cheat sheet integration

Frequently Asked Questions

This tool uses the browser's native JavaScript (ECMAScript) regular expression engine.