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JavaScript Regex Tester Online - Test Patterns & Replacements

Test JavaScript regex patterns on sample text, inspect capture groups, debug flags, and preview replacement output before changing code.

Category
Developer diagnostics
Privacy model
Sample text is processed locally in the browser.
Limitations
Uses the browser JavaScript RegExp engine, not every regex flavor.

Best for

  • Testing JavaScript regex before code changes
  • Debugging replacement output
  • Checking capture groups on sample log text

Inputs

  • JavaScript regex pattern
  • Flags
  • Sample text
  • Replacement text

Outputs

  • Matches
  • Capture groups
  • Replacement preview
  • Implementation notes