Python正则表达式将空间置于非重复时期之前

Question

例如给出字符串：

Reading my book... hate it... The childs is good read. This is funny.

它应该返回：

Reading my book... hate it... The childs is good read . This is funny .

请注意d和.之间的空格。

Answer 1

使用negative lookaround assertion，您可以过滤不遵循点（.）且后面没有点（(?<!\.)）的(?!\.)：

>>> text = 'Reading my book... hate it... The childs is good read. This is funny.'
>>> import re
>>> re.sub(r'(?<!\.)\.(?!\.)', r' .', text)  # Replace the matched dot with ` .`
'Reading my book... hate it... The childs is good read . This is funny .'