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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/RegExp/source below:

RegExp.prototype.source - JavaScript | MDN

RegExp.prototype.source

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概述

source 属性返回一个值为当前正则表达式对象的模式文本的字符串，该字符串不会包含正则字面量两边的斜杠以及任何的标志字符。

示例 使用 source 
const regex = /fooBar/gi;

console.log(regex.source); // “fooBar”，不包含 /.../ 和“gi”。
空正则表达式和转义 
new RegExp().source; // “(?:)”

new RegExp("\n").source === "\\n"; // true，从 ES5 开始
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