使用正则表达式将引号添加到python语句中的单词列表中

Question

我有一个单词列表，比如：

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

我只想在字符串中为这些单词添加引号：

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中实现这一点？你知道吗

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。在单词边界断言\b中包含交替模式，以便它只匹配整个单词。使用负的lookback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))

这将输出：

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

演示：https://ideone.com/Tf9Aka

Answer 2

不使用regex的解决方案：

txt = "Sita has apple and plum"
words = ["apple", "orange", "plum"]
txt = " ".join(["\""+w+"\"" if w in words else w for w in txt.split()])
print (txt)

txt = "Rita drinks apple flavored snapple?"
txt = " ".join(["\""+w+"\"" if w in words else w for w in txt.split()])
print (txt)

Answer 3

re.sub可以很好地处理这个问题

import re

mystr = "Rita has apple"
mylist = ["apple", "orange", "plum"]

for item in mylist:
    mystr = re.sub(item, '\"%s\"'%item, mystr)

print(mystr)