使用正则表达式按字符拆分

Question

I want to split a string by the char '-' along with the spaces to the left and right of it. How can I do this?

I tried a few things:

a.split('[\s]-[\s]')
a.split( *- *)
a.split(\s-\s)

Answer 1

If you want to remove all spaces around the '-', use this regex.

\s*-\s*

If you only want one optional space on either side, use this one.

\s?-\s?

Answer 2

import re
s = 'abc-abc- abc -abc - abc'
r = re.compile('\s*-\s*')
r.split(s)

Will give

['abc', 'abc', 'abc', 'abc', 'abc']

Answer 3

s='one - two - three - four'

print re.split(r'\s*-\s*',s)

prints:

['one', 'two', 'three', 'four']