What regular expression to use to format the contact list?

Question

Notepad++

Имя Фамилия
123456989
Кличка
243256345
Фамилия
635242345
Имя 
653424234

How can I make autocorrect in a text file (Notepad++) to achieve this format in one line

Имя, Фамилия, 123456989
Кличка, 243256345
Фамилия, 635242345
Имя , 653424234

Answer 1

\n(\d+)replace with , $1
That is, if there is a line feed and a number, then we change it to a comma, a space, and that same number

Answer 2

https://regex101.com/r/bhI5er/1/