How do I do conditionals in regex?

Question

Say, I want to split a string on either "。」" or " 。" , but not twice on "。」"

So for example:

s = "Something something。」 something something。 something。」that's great!"

I want to return

s = "Something something。」\n something something。\n something。」\nthat's great!"

I have trouble figuring how to split 。」 and not get 。\n」 or 。\n」\n

@sln Is $1 python? Sorry maybe I should have been more explicit about that — echan00, Nov 17 '18 at 00:07
So something like this? s.replace(r'(。」| 。)', r'$1\n') . Sorry, if I knew more about this I would be able to figure it out from your answer but I don't. — echan00, Nov 17 '18 at 00:13
See https://stackoverflow.com/questions/16720541/python-string-replace-regular-expression — , Nov 17 '18 at 00:15

score 1 · Accepted Answer · answered Nov 17 '18 at 00:19

In python you can implement the suggestions in the comments like this:

import re

s = "Something something。」 something something。 something。」that's great!"
pattern = re.compile(r'(。」|。)')
pattern.sub(lambda match: match.groups()[0] + '\n', s)

"Something something。」\n something something。\n something。」\nthat's great!"

Matches are greedy by default so that the longer pattern is used if possible (no split in the leading 。 if followed by 」).

How do I do conditionals in regex?

1 Answers1