Skip to main content

@babel/plugin-transform-unicode-regex

info

This plugin is included in @babel/preset-env

This plugin transforms regular expression literals to support the /u flag. 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.

Example​

In

JavaScript
var string = "foo💩bar";
var match = string.match(/foo(.)bar/u);

Out

JavaScript
var string = "foo💩bar";
var match = string.match(
  /foo((?:[\0-\t\x0B\f\x0E-\u2027\u202A-\uD7FF\uE000-\uFFFF]|[\uD800-\uDBFF][\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]))bar/
);

Installation​

npm install --save-dev @babel/plugin-transform-unicode-regex

Usage​

babel.config.json
{
  "plugins": ["@babel/plugin-transform-unicode-regex"]
}

Via CLI​

Shell
babel --plugins @babel/plugin-transform-unicode-regex script.js

Via Node API​

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