拆分字符串並用成分替換原始字符串

Question

假設我在字符串「Taco> Bell」中輸入文件，我想用「Taco>」和「Bell」替換該字符串。換句話說，我想用兩個替換一個字符串。我知道如何在正則表達式中使用split方法來分割字符串，但是如何執行替換？

每次有一個「>」後跟一個非空格字符的字符串時，我想在字符之間插入一個空格。

Answer 1

在這種情況下，你需要向前看，就像這樣：

import re 

mystring = "John likes to eat Taco>Bell because it is Bar>Foo healthy third> ok." 

print mystring 

mystring = re.sub(r">(?!)", "> ", mystring) 

print mystring 

基本上，替換隻發生如果按照>的字符不是一個空格。

輸出：

John likes to eat Taco>Bell because it is Bar>Foo healthy third> ok. 
John likes to eat Taco> Bell because it is Bar> Foo healthy third> ok. 

Answer 2

一種可能非正則表達式的解決辦法是

>>> somestr.replace(">","> ").replace("> ","> ") 
'John likes to eat Taco> Bell because it is Bar> Foo healthy third> ok.'