Regex for parsing Azure Blob URI (javascript)

parseAzureBlobUri.js

/**
 * Validates and parses given blob uri and returns storage account, container and blob names.
 * @param {string} blobUri - Valid Azure storage blob uri.
 *   Check link for more details: https://docs.microsoft.com/en-us/rest/api/storageservices/naming-and-referencing-containers--blobs--and-metadata#resource-uri-syntax .
 *   Few examples of valid uris:
 *     - https://myaccount.blob.core.windows.net/mycontainer/myblob
 *     - http://myaccount.blob.core.windows.net/myblob
 *     - https://myaccount.blob.core.windows.net/$root/myblob
 * @returns {Object} With following properties:
 *   - {string} storageAccountName
 *   - {string} containerName
 *   - {string} blobName
 * @throws {Error} If blobUri is not valid blob uri.
 */
const parseAzureBlobUri = (blobUri) => {
  const ERROR_MSG_GENERIC = 'Invalid blob uri.'
  
  const storageAccountRegex = new RegExp('[a-z0-9]{3,24}')
  const containerRegex = new RegExp('[a-z0-9](?!.*--)[a-z0-9-]{1,61}[a-z0-9]')
  const blobRegex = new RegExp('.{1,1024}')  // TODO: Consider making this one more precise.
  const blobUriRegex = new RegExp(
    `^http[s]?:\/\/(${ storageAccountRegex.source })\.blob.core.windows.net\/`
    + `(?:(\$root|(?:${ containerRegex.source }))\/)?(${ blobRegex.source })$`
  )
  const match = blobUriRegex.exec(blobUri)
  if (!match) throw Error(ERROR_MSG_GENERIC)
  
  return {
    storageAccountName: match[1],
    containerName: match[2] || '$root',  // If not specified, then it is implicitly root container with name $root.
    blobName: match[3]
  }
}

export default parseAzureBlobUri

While there is a method for parsing Azure Blob Uri in some of Azure SDKs, there is no such method (at least to my knowledge) in azure sdk for nodejs/javascript. I tried searching for regex online but could not find it, so I created my own and thought it would be useful to make it public in case somebody else needs the same thing.