Write, test, and debug regular expressions with live match highlighting.
Test and debug regular expressions with live match highlighting, flag toggles, and named capture group output. Instant feedback as you type.
A: It uses JavaScript's built-in RegExp engine, which follows the ECMAScript standard. This is the same engine used in Node.js and all modern browsers.
A: g = global (find all matches); i = case insensitive; m = multiline (^ and $ match line boundaries); s = dotAll (. also matches newlines).
A: Yes. Use (?<name>...) syntax and the matched group values will be shown in the match list.
A: Zero-length matches with the global flag can loop indefinitely. The tester automatically advances the cursor past zero-length matches to prevent hanging.
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