Replace forward slash with backward then forward slash

I want to replace all forward slashes with a backward slash followed by a forward slash.
Example:

../src/services/resource_mgmt/

Should be converted to

..\/src\/services\/resource_mgmt\/

I don’t know hot use replaceAll(...) with the correct regex.

>Solution :

const url = '../src/services/resource_mgmt/';
const newUrl = url.replaceAll(/\//g, '\\/');
console.log(newUrl);