Solution to github Warning: Unsafe Regular Expression

Issue: Github shows a warning for an unsafe regular expression on our config files for Cors regex

Reason
We are getting this warning as the regex that we have added is an open-end regex i.e. it can lead to many permutations of our websites.
let's say xyz.realdevsquad.com will also match the specified regex similarly many other combinations will sit.
This is not a good way of specifying allowed websites for CORS.
We need to have more strict validation for the allowed websites.

Resolution
To solve this we can provide an array of allowed websites which is supported by cors middleware. Read more here: https://www.npmjs.com/package/cors#configuring-cors-w-dynamic-origin

once this is set we will get rid of the unsafe regular expression warning.

Please write tests for it as well.

Start by locating the CORS regular expression in the config files and read the cors middleware documentation linked in the issue. Replace the open-ended origin pattern with an explicit allowed-websites array, add tests for the permitted and rejected origins, and run the relevant test suite to confirm the unsafe-regex warning is resolved.