code: def _from_safe_path_param_name(safe_parameter):
      
      assert safe_parameter.startswith('_')
      safe_parameter_as_base32 = safe_parameter[1:]
  
      padding_length = - len(safe_parameter_as_base32) % 8
      padding = '=' * padding_length
      return base64.b32decode(safe_parameter_as_base32 + padding)
docs: Takes a safe regex group name and converts it back to the original value.
  
      Only alphanumeric characters and underscore are allowed in variable name
      tokens, and numeric are not allowed as the first character.
  
      The safe_parameter is a base32 representation of the actual value.
  
      Args:
        safe_parameter: A string that was generated by _to_safe_path_param_name.
  
      Returns:
        A string, the parameter matched from the URL template.