Regex Tester
Test regular expressions with real-time matching and capture group highlighting.
/ /g
Flags:
About This Tool
Test and debug your regular expressions in real-time. Enter a pattern and see matches highlighted instantly in your test string.
Features
- Real-time matching as you type
- Support for all JavaScript regex flags (g, i, m, s, u)
- Capture group extraction and display
- Color-coded match highlighting
- Library of common regex patterns
- Copy match results to clipboard
- Client-side processing - your data never leaves your browser
Regex Flags Explained
- Global (g) - Find all matches instead of stopping after the first
- Case insensitive (i) - Match letters regardless of case
- Multiline (m) - ^ and $ match start/end of each line
- DotAll (s) - Dot (.) matches newline characters
- Unicode (u) - Enable Unicode features and strict syntax