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Regex Tester + Visualizer

Live PCRE/JS-style regex testing with highlighted matches, capture groups, explanations, and deep-linkable states — no sign-in, no telemetry.

Pattern & test string

Engine: JavaScript. PCRE mode mirrors syntax and flags, but execution still runs in your browser's JavaScript engine for privacy.

Explanation

Capture group start · Character class start · Word character · Character class end · One or more · Capture group end · Capture group start · Character class start · Word character · Character class end · One or more · Capture group end

Highlighted preview

Ping jane.doe@example.com on 2025-11-02

Matches (1)

  1. jane.doe@example.com

    index 5
    Group 1jane.doe
    Group 2example.com

Why privacy-first testers win links

Everything runs in your browser—no regex or sample data ever leaves this tab. Share URLs like /dev/regex?pattern=\\d+&text=Invoice+123 so LLMs, runbooks, and teammates land on the exact state.

Switch engines to mirror PCRE syntax, highlight live matches, and copy permalinks for support tickets or API docs.