Standards: filesystem
From wikinotes
filenames
ntfs
char_range = '^[a-zA-Z0-9{}]+'.format(re.escape('_ .()')) invalid_filenames = ( ['CON', 'PRN', 'AUX', 'NUL', 'CLOCK', '..', '.'] + ['COM{}'.format(i) for i in range(1, 10)] + ['LPT{}'.format(i) for i in range(1, 10)] )posix
char_range = '^[a-zA-Z0-9{}]+'.format(re.escape('_ .()')) invalid_filenames = ['..', '.']