RegExp.prototype.toString()

console.log(new RegExp("a+b+c"));
// : /a+b+c/

console.log(new RegExp("a+b+c").toString());
// : "/a+b+c/"

console.log(new RegExp("bar", "g").toString());
// : "/bar/g"

console.log(new RegExp("\n", "g").toString());
// : "/\n/g"

console.log(new RegExp("\\n", "g").toString());
// : "/\n/g"

toString()

const myExp = new RegExp("a+b+c");
console.log(myExp.toString()); // '/a+b+c/'

const foo = new RegExp("bar", "g");
console.log(foo.toString()); // '/bar/g'

new RegExp().toString(); // "/(?:)/"

new RegExp("\n").toString() === "/\\n/"; // true