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Regex Visualizer Online - Pattern Tester & Debugger

Free online regex visualizer. Test patterns with live highlighting, capture groups, and detailed explanations.

About Regex Visualizer

Test and visualize regular expressions with real-time match highlighting. See capture groups, match positions, and test your regex patterns against sample strings.

Features

  • Real-time regex testing with match highlighting
  • Support for all JavaScript regex flags (g, i, m, s, u, y)
  • Display of capture groups and match positions
  • Visual highlighting of all matches in the test string
  • Error reporting for invalid patterns
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How to Use Regex Visualizer

  1. Enter your input or configuration in the Regex Visualizer
  2. Set up test parameters and options as needed
  3. Click Test or Run to execute the test
  4. Review the results and output details

Common Use Cases

  • Understanding complex regex patterns in plain English
  • Debugging regular expressions with visual highlighting
  • Learning regex syntax through pattern explanation
  • Testing regular expressions against sample text

Frequently Asked Questions

Is Regex Visualizer free to use?
Yes, Regex Visualizer is completely free with no signup required. You can use it as many times as you need.
Is my data safe when using Regex Visualizer?
Absolutely. All processing happens directly in your browser. Your data is never sent to any server or stored anywhere.
Do I need to install anything?
No installation is needed. Regex Visualizer runs entirely in your browser and is ready to use immediately.
Can I save or share test results?
You can copy the results from the output area. All testing happens locally in your browser for maximum privacy.
Are there any rate limits?
No, since processing happens in your browser, there are no rate limits or usage restrictions.