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RegExp.prototype.flags - JavaScript | MDN
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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 2020年1月.
試してみましょう
// Outputs RegExp flags in alphabetical order
console.log(/foo/gi.flags);
// Expected output: "gi"
console.log(/bar/muy.flags);
// Expected output: "muy"
解説
RegExp.prototype.flags には値として文字列があります。flags プロパティのフラグはアルファベット順で並べ替えられます（左から右に、例えば "dgimsuvy"）。 実際には、他のフラグアクセサー（hasIndices、globalなど）を 1 つずつ呼び出し、結果を連結します。
すべての組み込み関数は、個々のフラグアクセサーを読み込む代わりに flags プロパティを読み込みます。
flags の設定アクセサーは undefined です。このプロパティを直接変更することはできません。
例
flags の使用
js
/foo/ig.flags; // "gi"
/bar/myu.flags; // "muy"
仕様書
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-get-regexp.prototype.flags |
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