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Regex tester

Write a pattern, paste some text, and every match lights up as you type, with the captured groups listed below.

//
Matches

    Patterns developers use every day

    MatchesPattern
    Email address (practical)[\w.+-]+@[\w-]+\.[\w.-]+
    URLhttps?:\/\/[^\s]+
    IPv4 address\b(?:\d{1,3}\.){3}\d{1,3}\b
    Date (YYYY-MM-DD)\d{4}-\d{2}-\d{2}
    Time (HH:MM, 24h)([01]\d|2[0-3]):[0-5]\d
    Hex color#(?:[0-9a-fA-F]{3}){1,2}\b
    UUID[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}
    URL slug^[a-z0-9]+(?:-[a-z0-9]+)*$
    Phone, international (E.164)^\+[1-9]\d{7,14}$
    Only digits^\d+$
    Leading and trailing spaces^\s+|\s+$

    How it works

    • JavaScript flavorPatterns run with the JavaScript engine in your browser, the same one Node.js uses.
    • Flagsg finds every match, i ignores case, m makes ^ and $ work per line, s lets . match new lines, u enables full Unicode.
    • GroupsParentheses capture parts of a match. They are listed as $1, $2 and so on.

    Questions

    Why does my pattern work here but not in Python?

    Regex flavors differ a little. Lookbehind, named groups and some escapes are written differently in Python, PCRE and JavaScript.

    Is my text sent anywhere?

    No. Matching happens in your browser.

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