Regex Tester
Test regular expressions against sample input with live match highlighting. Use this free online tool directly in your browser.
Flags
Test String
Replacement (optional — use $1, $2 for groups, $& for full match)
What is Regex Tester?
Regex Tester helps developers, designers, and content teams complete repetitive tasks faster. It is built for quick copy-and-paste workflows and practical day-to-day use.
How to use
- 1
Paste or enter your data in the Regex Tester input area.
- 2
Run the conversion, generation, or validation action.
- 3
Copy or download the result for your project workflow.
Try an Example
Example Input
Pattern: ^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$
Text: help@bitesizetools.comFrequently Asked Questions
What is Regex Tester?
Regex Tester is a free browser-based utility on Bite Size Tools. Test regular expressions against sample input with live match highlighting.
Is Regex Tester safe to use with sensitive data?
Yes. Tool processing runs in your browser, so your input is not sent to a server by default in this app.
Can I use Regex Tester for production work?
Yes. You can use the output directly in development and production workflows after validating it with your project requirements.