python - 使用正则表达式向 python 句子中的单词列表添加引号

Question

我有一个单词列表，例如:

["apple", "orange", "plum"]

我只想为字符串中的这些单词添加引号:

Rita has apple  ----> Rita has "apple"
Sita has "apple" and plum ----> Sita has "apple" and "plum"

如何使用正则表达式在 python 中实现此目的？

Answer 1

您可以将 re.sub 与通过连接列表中的单词创建的交替模式一起使用。将交替模式括在字边界断言 \b 中，以便它仅匹配整个单词。使用负lookbehind和lookahead来避免匹配已经用双引号括起来的单词:

import re
words = ["apple", "orange", "plum"]
s = 'Sita has apple and "plum" and loves drinking snapple'
print(re.sub(r'\b(?!<")(%s)(?!")\b' % '|'.join(words), r'"\1"', s))

输出:

Sita has "apple" and "plum" and loves drinking snapple

演示:https://ideone.com/Tf9Aka