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JavaScript Regex Tester & Debugger

Test and visualize JavaScript regular expressions interactively in your browser.

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Quick Patterns

About Regex Tester & Debugger

Master regular expressions with our real-time tester. Write patterns, instantly see matches highlighted in your test text, and inspect capturing groups. Includes a handy cheatsheet for quick reference.

Key Features

  • Real-time Match Highlighting
  • Full JavaScript Regex Support
  • Regex Flags Control (g, i, m, s, u, y)
  • Capturing Groups Visualization
  • Quick Reference Cheatsheet
  • Match Count & Indices

How It Works

  1. 1Enter your Regular Expression pattern in the input field.
  2. 2Toggle flags like 'Global' or 'Case Insensitive'.
  3. 3Type or paste your test string.
  4. 4Hover over highlighted matches to see details.
  5. 5Use the sidebar cheatsheet for syntax help.

Technical Specifications

Native JavaScript RegExp EngineSafe Execution SandboxVisual Match Overlay SystemPerformance-optimized Highlighting

Frequently Asked Questions

Which Regex flavor is supported?
We support JavaScript's RegExp flavor, which is standard for web development.
Why is my pattern not matching?
Check your flags (e.g., enable 'g' for multiple matches) and ensure special characters are escaped properly.