Spec: ECMAScript RegExp Specification
Category: Developer
100% In-Browser
Regex Tester & Match Analyzer
Test JavaScript Regular Expressions with real-time flag controls, match counts, and capture groups.
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Fast, client-side utility running in your browser memory with zero tracking and zero server uploads.
JavaScript RegExp Engine & Flags
Test regular expressions against multiline input with instant evaluation of flags:
- g (global): Find all matches rather than stopping at the first match.
- i (ignoreCase): Case-insensitive matching.
- m (multiline): Treat beginning (^) and end ($) assertions as working across each line.
- s (dotAll): Allow the dot (.) metacharacter to match newline characters.
Related In-Browser Utilities
Tested regex pattern? Transfer the verified regex to your production IDE.
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