Filter out text strings using regex of a URL.

filterString.js

// assuming env var
// BASE_URL=www.mydomain.com
  removebaseURL = (fullURL) => { // pass in (www.mydomain.com/kittens)
    // Allow api calls to handle just the end point (/kittens) or the full URL (www.mydomain.com/kittens)
    // by filtering out the base URL if the route contains it.
    const reg = new RegExp(process.env.BASE_URL, 'gi');
    const match = fullURL.match(r eg)
    let endpoint
    if (match) {
      endpoint = fullURL.split(reg)[1]
    } else {
      endpoint = fullURL
    }
    return endpoint // returns kittens
  }