Regex Tester & Debugger
Test JavaScript regular expressions with live matches
Nasıl çalışır
- 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.
Regex Tester & Debugger Hakkında
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. 712 Tools üzerindeki Regex Tester & Debugger tamamen browser'ınızda native JavaScript API'lerle çalışır - hiçbir server verilerinizi görmez. Yani anında sonuç, tam privacy ve upload limiti yok.
İster bir debugging session olsun, ister hızlı bir sanity check ya da bir production incident'ı - bu tool istediğiniz kadar ücretsiz kullanılabilir. Watermark yok, kayıt yok, tool içinde reklam yok.
Sık sorulan sorular
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.
Devamını oku
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The five fields, the special characters, and the schedules everyone actually uses. A field guide for anyone who Googles 'cron every 5 minutes' more than once a month.
The regex cheat sheet every JavaScript developer actually needs
Forget lookbehind edge cases. Here are the 15 patterns you'll use in real code - validation, extraction, replacement - with the JavaScript-specific gotchas.
Why your JSON won't parse (and how to fix it in 30 seconds)
Trailing commas, unquoted keys, single quotes, comments - the five errors that break 90% of hand-written JSON, and how to catch them without a build step.
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