替换所有出现的特定单词 [英] Replace all the occurrences of specific words

问题描述

假设我有以下句子:

bean 喜欢卖他的豆子

我想用其他词替换所有出现的特定词.例如，bean 到 robert 和 beans 到 cars.

我不能只使用str.replace，因为在这种情况下，它会将beans 更改为roberts.

<预><代码>>>>"bean 喜欢卖他的豆子".replace("bean","robert")'罗伯特喜欢卖他的罗伯茨'

我只需要更改整个单词，而不是该单词在另一个单词中的出现次数.我认为我可以通过使用正则表达式来实现这一点，但不知道该怎么做.

解决方案

如果你使用正则表达式，你可以用 \b 指定单词边界:

导入重新句子 = '豆子喜欢卖他的豆子'句子 = re.sub(r'\bbean\b', 'robert', 句子)#'罗伯特喜欢卖他的豆子'

此处 'beans' 未更改(更改为 'roberts')，因为末尾的 's' 不是单词之间的边界:\b 匹配空字符串，但 仅 在单词的开头或结尾.

完整性的第二个替换:

sentence = re.sub(r'\bbeans\b', 'cars', sentence)#罗伯特喜欢卖他的车"

Suppose that I have the following sentence:

bean likes to sell his beans

and I want to replace all occurrences of specific words with other words. For example, bean to robert and beans to cars.

I can't just use str.replace because in this case it'll change the beans to roberts.

>>> "bean likes to sell his beans".replace("bean","robert")
'robert likes to sell his roberts'

I need to change the whole words only, not the occurrences of the word in the other word. I think that I can achieve this by using regular expressions but don't know how to do it right.

解决方案

If you use regex, you can specify word boundaries with \b:

import re

sentence = 'bean likes to sell his beans'

sentence = re.sub(r'\bbean\b', 'robert', sentence)
# 'robert likes to sell his beans'

Here 'beans' is not changed (to 'roberts') because the 's' on the end is not a boundary between words: \b matches the empty string, but only at the beginning or end of a word.

The second replacement for completeness:

sentence = re.sub(r'\bbeans\b', 'cars', sentence)
# 'robert likes to sell his cars'

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