Regex Tester
Regex Tester: free, fast and private. Works in your browser, nothing is uploaded, no sign-up needed.
How to use
Test regular expressions against your own text with live match highlighting. See each match with its position and capture groups, try flags such as global, ignore case and multiline, and preview a replacement. The tester uses your browser’s JavaScript regex engine, so results match what you will get in JavaScript code.
- Paste or type your input.
- Adjust the options.
- Copy the result.
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Frequently asked questions
Which regex flavor is used?
JavaScript (ECMAScript) regular expressions. Syntax for other languages such as Python or PCRE may differ slightly.
What do the flags mean?
g finds all matches, i ignores case, m makes ^ and $ match at line breaks, s lets . match newlines, and u enables full Unicode support.
Is it free?
Yes. All tools are free, with no sign-up and no limits.
Is my code or data uploaded?
No. Everything runs locally in your browser, so your code and data stay private.
Does it work on mobile?
Yes. It works in any modern mobile or desktop browser.