Is there a way in Notepad to translate the next line into the previous one (combine lines)?

Question

Regular Expressions

Is there a way in notepad (Notepad++) using regular expressions / symbols (\r, \n, etc.) to translate the next line into the previous one (one line above), make the continuation of the line, combine them?
For example, it was:
Cell1 Cell2 Cell2
$$$
Should be:
Cell1 Cell2 Cell2 $$$

File format .csv, space separator

Answer 1

replace line breaks with spaces
str = str.replace(/\r?\n/g, ' ')

Answer 2

in sublimetext3 you can change it to /s depending on the syntax https://regex101.com/r/Ble3uj/1