python - 如何用正则表达式将此表单 : (word. Word) 替换为 (word.\nWord)？

Question

我想编写一个 Python 代码来检查字符串是否包含类似于以下内容的内容:

• 'word.Word' => 将其替换为 'word.\nWord'。
• smallLetter.capitalLetter => smallLeter.\nCapitalLetter.

我发现我应该使用 Python 正则表达式(实际上我不知道如何在其中编写格式!)

我尝试创建这个示例:

import re
text = 'What is the.What is thef.How did youDo that?F'
text = re.sub(r"(\.+[A-Z])", r".\n;", text)

输入:'What are you.How did you.When did youDo that?F'

输出:'What are you.\now did you.\nhen did youDo that?F'

我认为它有效，但我不想替换大写字母，我想将其保留在文本中。

例如:输入:'Hey.Wow' -> 输出:'Hey.\nWow'

Answer 1

不是匹配大写字母，而是检查它是否存在 positive-lookahead (对于具有正后视的小写字母也是如此):

\.+[A-Z]  -->  (?<=[a-z])\.(?=[A-Z])

例子:

import re

text = 'What is the.What is thef.how did you.Do that?F'
text = re.sub(r"(?<=[a-z])\.(?=[A-Z])", r".\n", text)
print(text)

将给予:

What is the.
What is thef.how did you.
Do that?F

Regex demo