用正则表达式替换两个不同的字符

Question

I want to use Regex to add a space between the parentheses and the arithmetic operators and digits. 我想使用Regex在括号与算术运算符和数字之间添加一个空格。

For example, I want to replace (+ 2 3) with ( + 2 3 ) 例如，我想将(+ 2 3)替换为( + 2 3 )

I wrote this Regex, but doesn't seem to work: 我写了这个正则表达式，但似乎不起作用：

((\(|\))[\d\w +*/-])+

I use Python to replace the characters in the string. 我使用Python替换字符串中的字符。

Answer 1

Regular Expression: ([(]+)|([)]+) 正则表达式： ([(]+)|([)]+)

Substitution: \\1 \\2 替代： \\1 \\2

Result: ( + 2 3 ) 结果： ( + 2 3 )

Answer 2

I think you want something like this, 我想你想要这样的东西

>>> import re
>>> s = "(+ 2 3)"
>>> m = re.sub(r'(?<=\()(?=[-\d+/*])|(?<=[-\d+/*])(?=\))', r' ', s)
>>> m
'( + 2 3 )'

Answer 3

I'm not sure about your requirement, but this is a possible solution: 我不确定您的要求，但这是可能的解决方案：

re.sub(r'([()+*/-]|\w+) *', r'\1 ', s)

DEMO DEMO

Sample input: 输入样例：

(+1 3)
(  +  4 (* (/ 6 4)74))
(+ u(- a34    234))

Sample output: 样本输出：

( + 1 3 ) 
( + 4 ( * ( / 6 4 ) 74 ) ) 
( + u ( - a34 234 ) )

The slight problem with this solution is that there is an extra space added at the end. 此解决方案的轻微问题是，最后增加了额外的空间。