Regex Tester (JavaScript)
Build, test, and debug regular expressions with match details and quick reference docs.
Open Tool →About PassGen Regex Tester
This tool helps you validate patterns, inspect captures, and understand JavaScript RegExp behavior quickly.
Features
⚡ Fast
Instant in-browser processing.
🛡️ Private
No input is uploaded to servers.
🌐 Accessible
Works on desktop and mobile browsers.
🧰 Practical
Built for real development and security workflows.
How to Use
- Open the tool from the button above.
- Paste input or use available upload options.
- Run conversion/generation and review the result.
- Copy the output and continue your workflow.
Frequently Asked Questions
Is this tool free?
Yes. It is free to use in your browser.
Is my data private?
Yes. Processing is done client-side with no uploads.
Can I use it on mobile?
Yes. The tool supports modern mobile browsers.