Test regular expressions with real-time match highlighting
Test and debug regular expressions in real-time. Enter a regex pattern and sample text, and see instant match highlighting with detailed capture group results. All processing happens locally in your browser — your data never leaves your device.
Zero server lag. All calculations run locally on your device for maximum speed.
Your data never leaves your device. No uploads, no servers, no tracking.
This tool uses JavaScript's native RegExp engine, which supports most standard regex features.
The global (g) flag finds all matches in the text, not just the first one. Without it, only the first match is returned.
The case-insensitive (i) flag makes the pattern match both uppercase and lowercase letters.
Capture groups are defined with parentheses () and let you extract specific parts of a match for further processing.