Developer Tools · Local processing
Regex Tester
Test a JavaScript regular expression and inspect its matches.
Your workspace Nothing to install. No signup.
How to use Regex Tester
Patterns run in a separate worker with a one-second limit to stop catastrophic backtracking from freezing the page. Up to 1,000 matches are shown, with positions and capture groups.
01
Add your input
Enter your text or values in the workspace above.
02
Choose your settings
Review the options and limits before processing.
03
Use your result
Check the output, then save or copy what you need.
Good to know
Does this tool upload my input?
No. This tool processes your input on your device. Its libraries load from this site. Your input is not sent to a processing service.
What should I check before using the result?
Patterns run in a separate worker with a one-second limit to stop catastrophic backtracking from freezing the page. Up to 1,000 matches are shown, with positions and capture groups.
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