在python3中替换字符串中的整个单词[重复]

Question

我需要帮助来仅从较长的字符串中替换整个单词，无论它们在字符串中的位置如何，而被替换的单词也在列表中，因此我们遍历所有单词并替换所有单词。 I have tried using this solution 但它不起作用，我还没有找到任何解决这个问题的方法。

我的代码是这样的：

import re

string1="box unbox boxing boxer box box"
string2="ban banana unban ban ban"
string3="box unbox boxing boxer box box ban banana unban ban ban"

dictionary={"box" , "ban"}

var = "chair"

pat = re.compile(r'\b' + '|'.join(dictionary) + r'\b')

string1 = pat.sub(var, string1)
string2 = pat.sub(var, string2)
string3 = pat.sub(var, string3)

print(string1)
print(string2)
print(string3)

我想要的是用“chair”替换“box”和“ban”词，无论它们在字符串的末尾或开头的位置，或者不管它周围有多少空格。它应该只替换原来的“box”和“ban”词。

目前的输出是这样的：

chair unbox chairing chairer chair chair
chair banana unchair chair chair
chair unbox chairing chairer chair chair chair banana unchair chair chair

我希望输出是这样的：

chair unbox boxing boxer chair chair
chair banana unban chair chair
chair unbox boxing boxer chair chair chair banana unban chair chair

Answer 1

您的问题是您的正则表达式构造为

\bbox|ban\b

它应该在哪里

\b(box|ban)\b

将相关行改为

pat = re.compile(r'\b(' + '|'.join(dictionary) + r')\b')

Answer 2

这可能是你想要的：

import re

strings = ["box unbox boxing boxer box box", "ban banana unban ban ban", "box unbox boxing boxer box box ban banana unban ban ban"]

lst = ["box" , "ban"]

rx = re.compile(r'\b(?:{})\b'.format("|".join(lst)))

strings = [rx.sub('chair', string) for string in strings]
print(strings)

这会产生

['chair unbox boxing boxer chair chair', 'chair banana unban chair chair', 'chair unbox boxing boxer chair chair chair banana unban chair chair']