如何在尚未被空格包围的短划线前后插入空格？

Question

假设我有这些弦：

string1= "Queen -Bohemian Rhapsody"

string2= "Queen-Bohemian Rhapsody"

string3= "Queen- Bohemian Rhapsody"

我希望他们都变成这样：

^{pr2}$

如何在Python中实现这一点？在

谢谢！在

Answer 1

您可以regexp：

import re
pat = re.compile(r"\s?-\s?") # \s? matches 0 or 1 occurenece of white space

# re.sub replaces the pattern in string
string1 = re.sub(pat, " - ", string1)
string2 = re.sub(pat, " - ", string2)
string3 = re.sub(pat, " - ", string3)