docs: def ResolveSubjectDestination(subject, regexes):
    """Returns the directory/filename where the subject will be stored.
  
    Args:
     subject: The subject.
     regexes: The list of regular expressions by priority.
  
    Returns:
     File name and directory.
    """
    components = Components(subject)
    if not components:
      # No components to work with.
      return "aff4", ""
    # Make all the components safe to use.
    path = utils.JoinPath(*[ConvertStringToFilename(x) for x in components])
    for route in regexes:
      m = route.match(path)
      if m:
        value = m.group("path")
        if value:
          base = os.path.basename(value)
          dirname = os.path.dirname(value)
          return base, dirname
    # Default value if nothing else matches.
    return "aff4", ""