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@babel/plugin-transform-duplicate-named-capturing-groups-regex

info

这个插件包含在 @babel/preset-env 中，在 ES2025。

这个插件可以将普通的正则表达式 字面量 转换为支持重复命名捕获组。它不会修改 new RegExp 构造函数，因为它的参数无法在静态时预先转换：要处理函数/类的运行时行为，你需要使用 polyfill。

🌐 This plugin transforms regular expression literals to support duplicate named capturing groups. It does not patch the new RegExp constructor, since its arguments cannot be pre-transformed statically: to handle runtime behavior of functions/classes, you will need to use a polyfill instead.

示例​

🌐 Examples

在

JavaScript
var re = /(?<year>\d{4})-(?<month>\d{2})|(?<month>\d{2})-(?<year>\d{4})/;

console.log(re.exec("02-1999").groups.year);

出

JavaScript
var re = _wrapRegExp(/(\d{4})-(\d{2})|(\d{2})-(\d{4})/, {
  year: [1, 4],
  month: [2, 3],
});

console.log(re.exec("02-1999").groups.year);

安装​

🌐 Installation

npm install --save-dev @babel/plugin-transform-duplicate-named-capturing-groups-regex

用法​

🌐 Usage

🌐 With a configuration file (Recommended)

babel.config.json
{
  "plugins": ["@babel/plugin-transform-duplicate-named-capturing-groups-regex"]
}

通过 CLI​

🌐 Via CLI

Shell
babel --plugins @babel/plugin-transform-duplicate-named-capturing-groups-regex script.js

通过 Node API​

🌐 Via Node API

JavaScript
require("@babel/core").transformSync("code", {
  plugins: ["@babel/plugin-transform-duplicate-named-capturing-groups-regex"],
});

选项​

🌐 Options

runtime​

boolean，默认是 true

当这个选项被禁用时，Babel 不会用 _wrapRegExp 助手封装正则表达式。输出只支持内部组引用，不支持运行时属性：

🌐 When this option is disabled, Babel doesn't wrap RegExps with the _wrapRegExp helper. The output only supports internal group references, and not runtime properties:

JavaScript
var stringRe = /(?:(?<quote>")|(?<quote>')).*?\k<quote>/;

stringRe.test("'foo'"); // "true", works
stringRe.exec("'foo'").groups.quote; // undefined
tip

你可以在这里了解更多关于配置插件选项的内容

参考​

🌐 References