Developer Tools
Regex Tester — Test Regular Expressions in Browser, No Upload
Test JavaScript regular expressions against any input with live match highlighting. Supports i, m, and s flags. Runs entirely in your browser — no upload, no server, no tracking.
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Frequently Asked Questions
- Which regex flavour is used?
- JavaScript RegExp — the same engine used in Node.js and all modern browsers.
- Are all matches found?
- Yes. The global flag (g) is always applied, so all non-overlapping matches are returned.
- What do the flags do?
- i = case insensitive, m = ^ and $ match line boundaries, s = dot matches newline characters.
- Is my text sent anywhere?
- No. Everything runs in your browser.