Regex Tester & Debugger

Test and debug your Regular Expressions against custom inputs in real-time.

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Regular Expression

//
Matches Found: 0

Test String

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Master Regular Expressions for Free

Regex can be notoriously difficult to get right. Our Free Regex Tester provides real-time matching and highlighting to help you debug your patterns before you deploy them.

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Key Features

  • Global & Case-Insensitive Flags: Toggle options easily.
  • Match Counts: See exactly how many hits your pattern gets.
  • Completely Free: Use it as much as you want at no cost.

Testing Features

  • Live Matching: See matches highlight as you type.
  • Match Groups: View captured groups and backreferences.
  • Flag Support: Test with g, i, m, s, u, and y flags.
  • Error Detection: Identify syntax errors in patterns.
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Common Use Cases

  • Form Validation: Test email, phone, and URL patterns.
  • Data Extraction: Parse structured text and logs.
  • Search & Replace: Build patterns for text processing.
  • Input Sanitization: Validate user input formats.
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