Regex Tester

Agent tools require a browser with WebMCP support. You can use this tool manually.

Test and validate regular expressions with real-time matching.

About This Tool

This regular expression tester allows you to test and validate regex patterns in real-time, with support for various regex flags and pattern matching visualization.

Features:

  • Real-time pattern matching
  • Support for all standard regex flags
  • Match highlighting and position information
  • Common regex pattern examples
  • Error detection and validation

Regex Flags:

  • Global (g) - Match all occurrences
  • Case Insensitive (i) - Ignore case when matching
  • Multiline (m) - ^ and $ match start/end of lines
  • Dot All (s) - Dot matches newlines
  • Unicode (u) - Enable full Unicode support
  • Sticky (y) - Match from lastIndex only

Special Characters:

  • * - Repeat the preceding expression zero or more times
  • . - Match any character except line breaks by default
  • [] - Match a character class
  • ^ and $ - Match start and end positions

Credits:

This tool uses JavaScript's native RegExp implementation for pattern matching and validation.

Privacy Note: Processing runs in your browser. When you use an agent, inputs and results may be shared with your agent provider. Avoid entering production secrets into agent-assisted drafts.