public static string GetResourceGroup(string resourceId)
{
const string resourceGroup = "resourceGroups";
var startIndex = resourceId.IndexOf(resourceGroup, StringComparison.OrdinalIgnoreCase) + resourceGroup.Length + 1;
var endIndex = resourceId.IndexOf("/", startIndex, StringComparison.OrdinalIgnoreCase);
return resourceId.Substring(startIndex, endIndex - startIndex);
}