code: def compile_suffix_regex(entries):
      
      expression = "|".join([piece + "$" for piece in entries if piece.strip()])
      return re.compile(expression)
docs: Compile a sequence of suffix rules into a regex object.
  
      entries (tuple): The suffix rules, e.g. spacy.lang.punctuation.TOKENIZER_SUFFIXES.
      RETURNS (regex object): The regex object. to be used for Tokenizer.suffix_search.