Regex Tester

Test regular expressions with live highlights.

regex tester, regular expression, pattern matching, regex validator, regex debugger, online regex, regex tool

Do not include slashes; set flags below.
Preview
0 matches found
Hello world hello WORLD https://example.com

About Regex Tester

Regular expressions (regex) are powerful pattern-matching tools used by developers worldwide. Our Regex Tester provides an intuitive interface to test, debug, and refine your regular expressions with real-time feedback. Features include support for all major flags (case-insensitive, global, multiline, dotAll), live syntax highlighting of matches in your test text, match count and position indicators, and a built-in library of common regex patterns for emails, URLs, phone numbers, and more. Whether you're parsing log files, validating user input, or extracting data from text, this tool makes regex development faster and less error-prone. All operations run client-side for maximum speed and privacy.

Key Features

  • โœ“100% Free: No signup, no hidden fees, unlimited usage
  • โœ“Privacy First: All processing happens locally in your browser
  • โœ“Fast & Reliable: Instant results without server delays
  • โœ“No Installation: Works directly in your web browser
  • โœ“Mobile Friendly: Responsive design works on all devices

Frequently Asked Questions

How do I test multiple matches?
Enable the global (g) flag to find all matches in the input.
What regex flags are supported?
We support i (case-insensitive), g (global), m (multiline), and s (dotAll) flags.

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