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Regex Explainer — Gratis online tool

Leg elke reguliere expressie uit in begrijpelijk Nederlands

Plak een regex-patroon. Krijg een heldere uitleg van elk onderdeel in gewoon Nederlands. Gratis, direct, regelgebaseerd.

Plain English
Token-by-token
    Want to test your regex against real text? → Regex Tester
    📚
    Meer weten

    Free regex explainer — plain English breakdown of any pattern

    Toololis 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. Nee 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.

    Belangrijkste punten

    • Regex Explainer is a free, browser-based developer tool — explain any regular expression in plain english.
    • Nee signup, no downloads, no file uploads. Tools run in your browser; the few that need an outside service say so on the page.
    • 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 Toololis — 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

    Prijs
    Gratis — geen limieten, geen watermerk, geen paywall
    Privacy
    Wordt in je browser verwerkt. Tools die een externe dienst nodig hebben, vermelden dat op de pagina. Paginabezoeken worden geteld (Google Analytics).
    Platform
    Elke moderne browser — desktop, tablet of mobiel
    Categorie
    Developer Tools on Toololis
    Offline
    Works offline after first visit (Progressive Web App)
    FunctieDetails
    ToolRegex Explainer
    CategorieDeveloper
    Aanmelden vereistNee
    Bestand uploadenGeen — verwerkt in browser
    Mobiel ondersteundVolledig responsive
    KostenVoor altijd gratis

    Why Use Regex Explainer?

    You should try Regex Explainer for a quick, private way to explain any regular expression in plain english. Processing happens in your browser and files are never uploaded; the few tools that need an outside service say so on the page.

    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% Privacy. Deze tool draait volledig in je browser. Je gegevens worden nooit naar een server geüpload.