docs: def plugin_request(plugin_str):
      '''
      Extract plugin name and version specifiers from plugin descriptor string.
  
      .. versionchanged:: 0.25.2
          Import from `pip_helpers` locally to avoid error `sci-bots/mpm#5`_.
  
          .. _sci-bots/mpm#5: https://github.com/sci-bots/mpm/issues/5
      '''
      from pip_helpers import CRE_PACKAGE
  
      match = CRE_PACKAGE.match(plugin_str)
      if not match:
          raise ValueError('Invalid plugin descriptor. Must be like "foo", '
                           '"foo==1.0", "foo>=1.0", etc.')
      return match.groupdict()