Python正则表达式将替换所有模式，除非它与重复模式相邻

Question

我使用的是Python，我有一个多行字符串，看起来像：

The quick brown fox jumps over the lazy dog. 
The quick quick brown fox jumps over the quick lazy dog. This a very very very very long line.
This line has other text?
The quick quick brown fox jumps over the quick lazy dog.

我想用slow替换所有出现的quick，但有一个例外。当quick由quick进行时，只有第一个quick被第二个quick转换，相邻的quick保持不变。你知道吗

因此，输出应该如下所示：

The slow brown fox jumps over the lazy dog. 
The slow quick brown fox jumps over the slow lazy dog. This a very very very very long line.
This line has other text?
The slow quick brown fox jumps over the slow lazy dog.

我可以使用多个过程来实现这一点，首先将所有内容转换为slow，然后在第二个过程中转换边缘大小写。但我希望有一个更优雅或明显的一次性解决方案。你知道吗

Answer 1

您可以利用分组完成此任务，方法如下：

import re
txt1 = 'The quick brown fox jumps over the lazy dog.'
txt2 = 'The quick quick brown fox jumps over the quick lazy dog.'
out1 = re.sub(r'(quick)((\squick)*)',r'lazy\2',txt1)
out2 = re.sub(r'(quick)((\squick)*)',r'lazy\2',txt2)
print(out1) # The lazy brown fox jumps over the lazy dog.
print(out2) # The lazy quick brown fox jumps over the lazy lazy dog.

想法很简单：第一组用于第一个quick，第二组用于rest quicks。然后将其替换为lazy和第2组的内容。你知道吗