RegExp.prototype.hasIndices

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.

hasIndices 访问器属性指示 d 标志是否与正则表达式一起使用。

尝试一下

const regex1 = new RegExp("foo", "d");

console.log(regex1.hasIndices);
// Expected output: true

const regex2 = new RegExp("bar");

console.log(regex2.hasIndices);
// Expected output: false

描述

如果 d 标志被使用,则 RegExp.prototype.hasIndices 的值是 true;否则是 falsed 标志表示正则表达式匹配的结果应该包含每个捕获组子字符串开始和结束的索引。它不会以任何方式改变正则表达式的解释或匹配行为,它只在匹配的结果中提供额外的信息。

hasIndices 的 set 访问器是 undefined。你不能直接修改此属性。

示例

使用 hasIndices

js
const str1 = "foo bar foo";

const regex1 = /foo/dg;

console.log(regex1.hasIndices); // Output: true

console.log(regex1.exec(str1).indices[0]); // Output: Array [0, 3]
console.log(regex1.exec(str1).indices[0]); // Output: Array [8, 11]

const str2 = "foo bar foo";

const regex2 = /foo/;

console.log(regex2.hasIndices); // Output: false

console.log(regex2.exec(str2).indices); // Output: undefined

规范

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

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
hasIndices

Legend

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Full support
Full support

参见