code: def get_filename_from_headers(headers):
      
      cd = headers.get('content-disposition', '')
      match = re.search('filename="?([^"]+)"?', cd)
      return match.group(1) if match else None
docs: Get a filename from the Content-Disposition header, if available.
  
      >>> from planet.api import utils
      >>> headers = {
      ...     'date': 'Thu, 14 Feb 2019 16:13:26 GMT',
      ...     'last-modified': 'Wed, 22 Nov 2017 17:22:31 GMT',
      ...     'accept-ranges': 'bytes',
      ...     'content-type': 'image/tiff',
      ...     'content-length': '57350256',
      ...     'content-disposition': 'attachment; filename="open_california.tif"'
      ... }
      >>> name = utils.get_filename_from_headers(headers)
      >>> print(name)
      open_california.tif
      >>>
      >>> headers.pop('content-disposition', None)
      'attachment; filename="open_california.tif"'
      >>> name = utils.get_filename_from_headers(headers)
      >>> print(name)
      None
      >>>
  
      :param headers dict: a ``dict`` of response headers
      :returns: a filename (i.e. ``basename``)
      :rtype: str or None