FREE · DEVELOPER TOOLS
Regex Tester.
Test JavaScript regular expressions and inspect matches and capture groups.
How to use Regex Tester
Enter or choose the required input, adjust the settings, then generate and review the result. \d+ finds 42 in Order 42.
How it works
Test JavaScript regular expressions and inspect matches and capture groups. 50,000 input characters; execution runs in a worker with a two-second limit. Inputs stay on your device. Review the preview or output before using it; refresh the page to clear the current working session.
Example
\d+ finds 42 in Order 42.
Questions about Regex Tester
Is Regex Tester free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
50,000 input characters; execution runs in a worker with a two-second limit. At most 1,000 matches are displayed. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.