Notepad++ : Insert blank new line after match of some string

问题

I want to insert new line after (4) option in whole document in notepad++

1. For his alleged involvement in
   espio-nage
   (1) abc
   (2) sdf
   (3) asf
   (4) agg
2. When the Principal was entering
   the class, all my friends quietly...
   (1) dfg
   (2) hsc
   (3) sdg
   (4) fse

Below expression is not working.
Find what: ^.+(4)
Replace with: \n$0

回答1:

Should be like this.

Find: (\(4\).+)

Replace: $1\n

Keep in mind that the brackets ( and ) have a special meaning in regex, so you should escape them with \.

来源：https://stackoverflow.com/questions/51870346/notepad-insert-blank-new-line-after-match-of-some-string