Regex Tester
Test a JavaScript regular expression against sample text.
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Frequently Asked Questions
Which regex engine does it use?
It uses JavaScript regular expressions, the same syntax used in browsers and Node.js.
Can I set regex flags?
Yes. Enter flags like g, i, m, or u in the flags field to control global, case-insensitive, multiline, and Unicode matching.
How do I see what my regex matches?
Enter a pattern and test string and the matches are shown instantly, so you can refine the expression as you type.
Is the regex tester free and private?
Yes. It is free, needs no sign-up, and runs in your browser, so your patterns and text are never uploaded.