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Explicateur Regex — Outil en ligne gratuit

Explique n'importe quelle expression régulière en langage clair

Colle un pattern regex, obtiens une explication claire de chaque partie. Gratuit, instantané, basé sur des règles. Sans inscription.

Plain English
Token-by-token
    Want to test your regex against real text? → Regex Tester
    📚
    En savoir plus

    Free regex explainer — plain English breakdown of any pattern

    Outilolis Regex Explainer translates any regular expression into plain English. Paste a cryptic pattern, see what each token does. Perfect for reviewing legacy code, learning regex, or documenting complex patterns.

    How to use this tool

    1. 1

      Paste your regex

      Any JavaScript-style regex pattern. Non leading/trailing slashes needed.

    2. 2

      Read the explanation

      Each token gets a plain-English description. Character classes, anchors, quantifiers, groups — all explained.

    3. 3

      Try presets

      Common patterns (email, URL, phone) come pre-loaded. See how they work.

    What we explain

    • Character classes — [a-z], [0-9], [^abc]
    • Anchors — ^, $, \b, \B
    • Quantifiers — *, +, ?, {n}, {n,m}, lazy (*?)
    • Groups — (), (?:), (?<name>), alternation |
    • Lookarounds — (?=), (?!), (?<=), (?<!)
    • Shortcuts — \d, \w, \s, \D, \W, \S
    • Escapes — \., \\, \n, \t

    Frequently Asked Questions

    What regex flavor is supported?
    JavaScript regex (ECMAScript). Covers 95% of regex you'll see. Some PCRE-only features (like atomic groups) aren't valid in JS but we flag them.
    Is this 100% accurate?
    Very close — we parse the regex token-by-token using a real regex-to-AST approach. Complex lookbehind / recursive patterns may have simplified explanations.
    Does it show what the regex matches?
    For explanation, yes. For testing matches against text, use our Regex Tester.
    Why do I need this?
    Regex is famously "write-only" — easy to write, hard to read. When you come back to old code or inherit someone else's regex, this saves minutes of decoding.
    What about regex I don't fully understand?
    Paste it here — you'll see what each piece does. Great for learning regex without reading a textbook.

    À retenir

    • Regex Explainer is a free, browser-based developer tool — explain any regular expression in plain english.
    • Non signup, no downloads, no file uploads — your data stays on your device.
    • Works on desktop, tablet, and mobile. Install as a PWA for offline access.

    How to Use Regex Explainer

    1. Open the tool: Launch Regex Explainer on Outilolis — no account or download needed.
    2. Enter your data: Paste text, enter values, or select a file directly in your browser.
    3. Get instant results: Everything is processed locally — results appear immediately.
    4. Copy or download: Save your output or share it. Bookmark for quick access next time.

    Regex Explainer — Quick Facts

    Prix
    Gratuit — sans limites, sans filigrane, sans paywall
    Confidentialité
    100% dans le navigateur — aucune donnée n’est envoyée à un serveur
    Plateforme
    Tout navigateur moderne — desktop, tablette ou mobile
    Catégorie
    Développeur Outils on Outilolis
    Hors ligne
    Works offline after first visit (Progressive Web App)
    CaractéristiqueDétails
    OutilRegex Explainer
    CatégorieDéveloppeur
    Inscription requiseNon
    Téléversement de fichierAucun — traité dans le navigateur
    Compatible mobileEntièrement adaptatif
    CoûtGratuit pour toujours

    Why Use Regex Explainer?

    You should try Regex Explainer for a quick, private way to explain any regular expression in plain english. All processing happens in your browser. Your files and data never leave your device. According to web.dev, client-side processing is the gold standard for privacy.

    On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.

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    100% Confidentialité. Cet outil fonctionne entièrement dans votre navigateur. Vos données ne sont jamais envoyées à un serveur.