drupal_lookup_path() have been remove in Drupal 8. However, I cannot find a way to achieve the same functionality. All, I'm trying to do is to provide Drupal with a path and he is going to look to see if exist, if exist is going to provide me the node id. If does not exist that path he going to give me an error or null/0.
How can I achieve this on Drupal 8?