Interactive Regex Tester & Visualizer

Test, debug, and learn Regular Expressions with our powerful and intuitive online tool. This real-time RegEx tester provides instant visual feedback, highlighting all matches and breaking down capture groups in a clear, easy-to-understand list. Combined with an interactive cheatsheet, it's the perfect environment for both beginners learning the ropes and experts perfecting complex patterns.

How It Works

Our Regex tool is designed for an immediate, interactive experience. The results update live as you type, providing instant validation and analysis.

  1. Write Your Pattern: Enter your regular expression in the dedicated input field.
  2. Provide a Test String: Paste or type the text you want to test your pattern against.
  3. Set Flags: Use the checkboxes to toggle common RegEx flags like global (`g`) and case-insensitive (`i`).
  4. Analyze the Results: Instantly see all matches highlighted in your text and explore a detailed breakdown of each match and its capture groups.

Key Features

  • Real-Time Matching: The tool runs your RegEx against the test string live as you type, with a smart delay to ensure a smooth, responsive experience.
  • Live Match Highlighting: All occurrences that match your pattern are instantly highlighted in the output view, giving you a clear visual representation of what your RegEx is doing.
  • Detailed Match & Group Breakdown: A comprehensive list shows every individual match. For each match, it also displays a sub-list of all captured groups, making it easy to debug and verify your pattern's logic.
  • Interactive RegEx Cheatsheet: A built-in, toggleable sidebar provides a handy RegEx cheatsheet. Clicking any item in the cheatsheet will instantly insert its syntax into the pattern input field at your cursor's position.
  • Full Flag Control: Easily enable or disable common RegEx flags (`g`, `i`, `m`, `s`, `u`, `y`) with simple checkboxes.
  • Instant Error Feedback: If your RegEx pattern contains a syntax error, the tool immediately flags the input field and displays a clear error message, helping you fix it on the fly.
  • Responsive, Mobile-First Design: The interface uses a clean, tabbed layout on smaller screens, ensuring a great experience on any device.
  • Convenient Utilities: A one-click button allows you to copy your final RegEx pattern to the clipboard.

How to Use the Tool

  1. Step 1: Write Your Pattern
    Enter your expression in the "Regex Input" field. Click the help icon to open the cheatsheet and click on any syntax to insert it.
  2. Step 2: Add Your Test String
    Populate the "Test String" field with the content you want to search.
  3. Step 3: Configure Flags
    Select the appropriate flags for your search (e.g., check `g` for a global search).
  4. Step 4: Examine the Results
    Observe the highlighted text for a quick visual. Then, scroll down to the "Match List" to see a detailed breakdown of each match and its corresponding capture groups.

Find Our Tool

Regex Tester, Regular Expression Tester, Regex Visualizer, Regex Debugger, Regex Cheatsheet, Online Regex Tool, JavaScript Regex Tester, Test Regex Online, Regex Matcher, Regex Capture Groups.