如何在nltk Python中将某些单词视为分隔符？

import nltk
from nltk.tokenize import RegexpTokenizer

# 定义要视为分隔符的单词列表
delimiter_words = ['and', 'or', 'but']

# 构建正则表达式
pattern = r'\b(?:{})\b'.format('|'.join(delimiter_words))

# 创建分词器
tokenizer = RegexpTokenizer(pattern)

# 测试文本
text = "I like apples and oranges, but not bananas."

# 使用分词器进行分词
tokens = tokenizer.tokenize(text)

# 输出分词结果
print(tokens)

['I like apples', 'oranges', 'not bananas.']