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 July 2015.

RegExp 实例的 flags 访问器属性返回当前正则表达式的标志

尝试一下

// Outputs RegExp flags in alphabetical order

console.log(/foo/gi.flags);
// Expected output: "gi"

console.log(/bar/muy.flags);
// Expected output: "muy"

描述

RegExp.prototype.flags 具有一个字符串值。flags 属性中的标志按字母顺序排列(从左到右,例如 "dgimsuvy")。它实际上调用了其他标志访问器(如 hasIndicesglobal 等)并逐个连接这些结果。

所有内置函数都是读取 flags 属性,而不是读取单独的标志访问器。

flags 的 set 访问器是 undefined。因此你不能直接修改该属性。

示例

使用 flags

js
/foo/gi.flags; // "gi"
/bar/muy.flags; // "muy"

规范

Specification
ECMAScript® 2025 Language Specification
# sec-get-regexp.prototype.flags

浏览器兼容性

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desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
flags

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Full support
Full support

参见