Regex Tester
Test regular expressions against sample text, highlight matches and inspect capture groups.
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How the Regex Tester works
Test regular expressions against sample text, highlight matches and inspect capture groups. No sign-up, no uploads — everything runs in your browser.
Frequently asked questions
Which flags can I use?
The tester supports g (global), i (case-insensitive), m (multiline), s (dotAll), u (unicode) and y (sticky), matching JavaScript regular expressions.
Is my test text private?
Yes. The regex runs in your browser and your text is never uploaded.