Common use cases
- Debug validation patterns.
- Extract values from logs or text.
- Prototype find-and-replace expressions.
DEVELOPER TOOL · PRIVATE
Regex Tester Online
Test JavaScript regular expressions against sample text.
Experiment with JavaScript-compatible regular expressions and inspect every match.
This free regex tester online runs directly in your browser. Your input does not need to be uploaded to a Kaazo processing server, making it useful for quick everyday work on desktop or mobile.
Ready — input is processed locally.
✓
Private browser processing
This utility runs on the current device for the supported workflow. Kaazo does not need the pasted input to calculate the result.
About Regex Tester online
Regex Tester is a free browser-based developer and data utility designed to test JavaScript regular expressions against sample text. If you are looking for a practical Regex Tester online, this page focuses on that specific task with the controls, instructions and related utilities kept together in one place.
A common reason to use this tool is to debug validation patterns. It can also help when you need to extract values from logs or text. The operation runs in the current browser tab, so the text or values you enter do not need to be sent to a Kaazo processing server. This can be especially useful for quick work on personal documents, business files, web content or development data where you want a straightforward result without creating an account.
InputText or values entered in the browser
ProcessingLocal in-browser processing for the supported task
AccountNo sign-up required
CostFree browser utility
How to use the Regex Tester
- Enter or paste the information into the fields above.
- Choose any available options for the result you need.
- Select Process and review the result generated in your browser.
- Copy or download the output if you want to use it elsewhere.
When to use Regex Tester
Experiment with JavaScript-compatible regular expressions and inspect every match.
Tips for better results
- Test edge cases, not just one happy-path example.
- Use the global flag when you need every match.
- Escape user-provided patterns before building production regexes.
Privacy and browser compatibility
The supported operation runs locally in a modern browser, so the text or values you enter do not need to be sent to Kaazo for server-side processing. Very large inputs can still be limited by the memory and performance of your device.
For business, financial, legal or production-development work, review the result before using it as a final source of truth. A browser utility is designed to speed up common tasks, not replace specialist professional software or advice where that is required.
Regex Tester FAQ
What does Regex Tester do?
Regex Tester is designed for one focused task: Test JavaScript regular expressions against sample text. The controls above let you complete that workflow directly in your browser.
Is Regex Tester free to use?
Yes. You can use Regex Tester on Kaazo Tools without creating an account.
Do I need to install software to use Regex Tester?
No. The tool works in a modern web browser.
Can I use Regex Tester on a phone?
Yes. The interface is responsive, although larger files and more complex tasks are usually easier on a device with more memory and a larger screen.
Should I verify the output before using it?
Yes. Review generated code, metadata, URLs, security-related values and marketing outputs before publishing or relying on them.
Related tools
Continue with other private Kaazo utilities.
Browse more Developer Tools for related workflows.