Regex Tester & Debugger
Test JavaScript regular expressions with live matches
Cara pakai
- 1Enter your pattern
Type or paste your regex in the pattern box. Pick the flags you need (g, i, m, s, u).
- 2Add test text
Paste the string you want to test against. Matches update live.
- 3Inspect matches
See highlighted matches, capture groups, and total match count in real time.
Tentang Regex Tester & Debugger
Free online regex tester for JavaScript regular expressions. See matches highlighted live as you type, view capture groups, test flags (g, i, m, s, u, y), and get match counts. Runs entirely in your browser - no signup, no ads inside the tool. Regex Tester & Debugger di 712 Tools jalan sepenuhnya di browser kamu pakai JavaScript API native - tidak ada server yang pernah melihat data kamu. Artinya hasil instan, privasi penuh, dan tanpa batas upload.
Buat sesi debug, quick sanity check, atau incident produksi - tool ini gratis dipakai sebanyak yang kamu butuh. Tanpa watermark, tanpa signup, dan tanpa ads di dalam tool.
Pertanyaan yang sering ditanyakan
Which regex flavor is this?
JavaScript (ECMAScript) - the same regex engine that runs in your browser and Node.js.
Does it support named groups?
Yes. Named capture groups like (?<year>\d{4}) are shown alongside numbered groups in the results panel.
Is my pattern or text uploaded?
No. Everything runs in your browser via the native RegExp engine.
Why is my pattern hanging?
You may have hit catastrophic backtracking - a common issue with nested quantifiers like (a+)+. Simplify the pattern.
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