用n之间的破折号替换某个子字符串-python

Question

Is there any string manipulation in python that can achieves the following input and output? If i'm going to use regex how would the regex expression look like to replace the substring?

#inputs
y = sentence-with-dashes
x = this is a sentence with dashes

#output
z = this is a sentence-with-dashes

#####################################
#sometimes the input is pretty messed up like this
y = sentence-with-dashes
x = this is a sentence-with dashes

#output
z = this is a sentence-with-dashes

Answer 1

I think this should do the trick:

y='sentence-with-dashes'
x='this is a sentence with dashes'
r=re.compile(re.escape(y).replace('\\-','[- ]'))
z=re.sub(r,y,x)

this won't touch any hyphens that appear outside the y value, if you don't care about this then eumiro's answer is simpler, and doesn't require the use of regex.

Answer 2

如果这些是唯一的破折号：

z = x.replace('-', ' ').replace(y.replace('-', ' '), y)