Regex Tester

Test and debug regular expressions with real-time matching, syntax highlighting, and detailed match information.

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Flags:
Common Regex Patterns

How to Use Regex Tester

  1. Enter your regular expression pattern in the regex field
  2. Select appropriate flags (g for global, i for case-insensitive, etc.)
  3. Enter or paste your test string in the text area
  4. View real-time matches highlighted in the preview
  5. Check match details including position and capture groups
  6. Use common patterns as templates for quick testing
  7. Download or copy results for documentation

Best Regex Tester Features

  • Real-Time Testing: See matches instantly as you type
  • Syntax Validation: Immediate feedback on regex errors
  • Match Highlighting: Visual feedback with color-coded matches
  • Capture Groups: Detailed view of all captured groups
  • Common Patterns: Pre-built regex templates for common use cases
  • Performance Metrics: Execution time tracking
  • All Regex Flags: Support for g, i, m, s, u, y flags
  • Export Options: Download detailed test reports

Regex Flag Reference

  • g (global): Find all matches rather than stopping after first
  • i (case-insensitive): Ignore letter case when matching
  • m (multiline): ^ and $ match start/end of each line
  • s (dotAll): . matches newline characters
  • u (unicode): Enable Unicode support
  • y (sticky): Match from lastIndex position only

Top Use Cases

  • Email validation and extraction
  • URL parsing and validation
  • Phone number formatting
  • Data extraction from logs
  • Input validation in forms
  • Text search and replace
  • Code syntax checking
  • Web scraping patterns