text: ######################################
  # unicode dual mode
  import re
  re_numbers_str = re.compile(r'\d+')
  re_words_str = re.compile(r'\w+')
  re_numbers_bytes = re.compile(rb'\d+')
  re_words_bytes = re.compile(rb'\w+')
  text_str = ('Ramanujan saw \u0be7\u0bed\u0be8\u0bef'
      " as 1729 = 1³ + 12³ = 9³ + 10³.")
  text_bytes = text_str.encode('utf_8')
  print('Text', repr(text_str), sep='\n ')
  print('Numbers')
  print('   str  :', re_numbers_str.findall(text_str))
  print('   bytes:', re_numbers_bytes.findall(text_bytes))
  print('   str  :', re_words_str.findall(text_str))
  print('   bytes:', re_words_bytes.findall(text_bytes))