输入
const foo = 'ab+';
var a = new RegExp(foo+'c', 'i');
输出
const foo = 'ab+';
var a = /ab+c/i;
npm install babel-plugin-transform-regexp-constructors
.babelrc（Recommended）.babelrc
{
"plugins": ["transform-regexp-constructors"]
}
babel --plugins transform-regexp-constructors script.js
require("babel-core").transform("code", {
plugins: ["transform-regexp-constructors"]
});