Pattern utility
Regex Tester
Test regular expressions against sample text in your browser for validation, parsing, search, replacement planning, and development workflows.
Matches
Run a pattern against the sample text to see matches.
What this tool is useful for
- Checking email, URL, and token-matching patterns
- Testing search and validation logic before coding it
- Reviewing global matches in copied data quickly
Common mistakes
Common mistakes include forgetting escape characters, testing against unrealistic sample text, or assuming every regex engine behaves the same way across languages and platforms.
Related workflows