Regex Tester
Test patterns, inspect matches and groups, and preview replacements. All processing stays in your browser.
Matches
Run Test to see matches here.
Which regex syntax is supported?
The tester uses the JavaScript regular expression engine, including flags and named capture groups.
Is my text private?
Yes. Matching runs in your browser, so your patterns and sample text stay on your device.
Can I preview replacements?
Yes. Provide a replacement string to see the substituted output instantly.