拆分字符串并用成分替换原始字符串

Question

让我说我在输入文件中读到字符串＆＃34; Taco＆gt; Bell＆＃34;我想用＆＃34; Taco＆gt;＆＃34;替换那个String。和贝尔＆＃34;。换句话说，我想用一个String替换一个String。我知道如何使用带有正则表达式的split方法来拆分String，但是如何执行替换？

每次有一个字符串，其中包含＆＃34;＆gt;＆＃34;后跟一个非空格字符，我想在字符之间插入一个空格。

Answer 1

在这种情况下，你需要展望未来，如下：

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，只有在>之后的字符不是空格时才会进行替换。

输出：

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

可能的非正则表达式解决方案

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