How to Use the Regex Tester
Test, debug, and understand your regular expressions with live visual highlighting.
Steps
- Enter your regular expression in the "Pattern" field at the top.
- Type or paste the text you want to test into the main text area.
- Matches will be instantly highlighted in real-time as you type.
- Review the capture groups breakdown and match counts below the text box.
About This Tool
This tester uses your browser's native JavaScript RegExp engine. It features a transparent textarea superimposed over a styled backdrop to provide instant, lag-free match highlighting directly in the editor.
FAQs
1. Which regex engine does it use?
It uses the standard JavaScript RegExp engine built into your web browser.
2. Are global and multiline flags supported?
Yes. You can toggle common flags (Global, Case-Insensitive, Multiline) directly from the interface.
3. Can I test replacements?
Yes, there is a dedicated tab to test Regex replacements and preview the resulting string.