Dear Maintainer,


installing software-properties-gtk today per aptitude caused the
following warning message:

software-properties-gtk (0.99.30-4) wird eingerichtet ...
/usr/lib/python3/dist-packages/softwareproperties/gtk/DialogMirror.py:197: SyntaxWarning: invalid escape sequence '\.'
  elif re.match("^((ftp)|(http)|(file)|(rsync)|(https))://([a-z]|[A-Z]|[0-9]|:|/|\.|~)+$", uri) == None:

It seems the installation completed successfully regardless.

Still this should be fixed, IMHO.