You need to use Search using Regular Expression action.
RegEx:
^(.*)[\n\r](.*)
Note that the RegEx allows for EITHER a linefeed (\n) OR a return (\r) as the line separator. Linefeed is the most common today, but you will still sometimes see return used.
BTW, in the future, please put all data in a Code Block so that all characters are properly preserved on the web page.
Questions?