Free RegEx Tester
Test regular expressions against sample text with real-time match highlighting. Every match is instantly highlighted in your test string so you can see exactly what your pattern captures. Supports all standard regex flags including case-insensitive (i), global (g), multi-line (m), and dot-all (s) modes. Whether you're validating email addresses in a web form, extracting phone numbers from logs, parsing URLs from text blocks, cleaning up imported data, building search patterns for code editors, or learning regex for the first time, this live tester helps you iterate quickly by showing results as you type.
How to Use
- Type your regex pattern in the pattern input field (without delimiters)
- Select flags like global (g), case-insensitive (i), multi-line (m)
- Enter test text in the sample area to see matches highlighted
- The tool shows match count and highlighted positions in real-time
Common Patterns
- Email:
[\w.+-]+@[\w-]+\.[\w.]+ - URL:
https?:\/\/[^\s]+ - Phone (US):
\d3-\d3-\d4 - Date:
\d4-\d2-\d2
Privacy
All regex processing happens locally in your browser. No data is transmitted.
Last reviewed: July 2026.