How to replace line break with comma(,) or something else in notepad.

I want to remove line break and replace it with comma(,) in note pad. Like below :

And i want to turn them into a paragraph with a comma at the end of each one? Like below:

Sollution :

Steps :

1.  Open the find and replace dialog. CTRL+H
2.  Then select match regular expressions at the bottom.
3.  Search for this [\r\n]+
4.  Replace with ,

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Chears 
Happy coading :)