class_docstr: Class for interacting with a GitHub repository.
  
  .. note::
  
      To interact with private GitHub repositories that you have access to,
      provide your GitHub personal access token by setting the
      ``GITHUB_TOKEN`` environment variable.
  
  Args:
      repo: the GitHub repository or identifier, which can be:
  
          -   a GitHub URL like ``https://github.com/<user>/<repo>``
          -   a GitHub ref like
              ``https://github.com/<user>/<repo>/tree/<branch>`` or
              ``https://github.com/<user>/<repo>/commit/<commit>``
          -   a GitHub ref string like ``<user>/<repo>[/<ref>]``
code: def parse_url(url):
      m = re.search(
          "github.com/(?P<user>[A-Za-z0-9_-]+)/((?P<repo>["
          "A-Za-z0-9_-]+)((/.+?)?/(?P<ref>[A-Za-z0-9_-]+)?/(?P<path>.*)?)?)",
          url.rstrip("/"),
      )
  
      try:
          return m.groupdict()
      except:
          raise ValueError(f"Invalid GitHub URL '{url}'")
  
imports: import logging
  import os
  import re
  import requests
  import eta.core.utils
  import eta.core.web
label_desc: Use image node_id 15 for calling the GitHubRepository obj's underlying member method code with example usage: obj.parse_url(url) and returns: m