RegExp.prototype.flags
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
Theflags accessor property ofRegExp instances returns theflags of this regular expression.
Try it
// Outputs RegExp flags in alphabetical orderconsole.log(/foo/gi.flags);// Expected output: "gi"console.log(/^bar/muy.flags);// Expected output: "muy"Description
RegExp.prototype.flags has a string as its value. Flags in theflags property are sorted alphabetically (from left to right, e.g.,"dgimsuvy"). It actually invokes the other flag accessors (hasIndices,global, etc.) one-by-one and concatenates the results.
All built-in functions read theflags property instead of reading individual flag accessors.
The set accessor offlags isundefined. You cannot change this property directly.
Examples
Using flags
js
/foo/ig.flags; // "gi"/^bar/myu.flags; // "muy"Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-get-regexp.prototype.flags |