How to split a string with a regex of 2 delimiters, but keep the delimiters in Python?

Question

Say I have this string. "+2x-10+5". I want to split it into ['+2x','-10','+5'].

So, I can use regular expression to make it ['2x','10','5'], but I want to keep the separators, which are the plus and minus signs.

How do I do this?

If you could share your code which you have come up with so far, then it would be much easier to help you out :) — S.D., Jul 17 '20 at 15:59
There could be a few different approaches to this. Can you show what you have written so far. You could either, instead of using split, just use a regex to capture in groups like `([+-]?\w+)` with re.findall. Alternatively if you really want to use re.split you could use a positive look ahead and look behind for the split. for example ` (?<=\w)(?=[+-])` — Chris Doyle, Jul 17 '20 at 15:59

score 0 · Accepted Answer · answered Jul 17 '20 at 16:00

0

Don't use re.split(), use re.findall() with a regexp that matches each sub-expression.

import re

s = "+2x-10+5"
result = re.findall(r'[-+]\w+', s)
print(result)

answered Jul 17 '20 at 16:00

Barmar

Thanks a lot for the simple and elegant answer!!! – VoidProgrammer Jul 17 '20 at 16:05

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