If you have a file or a string that you want to replace every new line with a comma follow the below steps,
- Open the file in Sublime Text Editor,
Example file with multiple lines
This is my Line 1 This is my Line 2 This is my Line 3 This is my Line 4 This is my Line 5
- Now press Control + H (or Command + H on macOS),
- Make sure you select .* button to enable RegEx,
- Now in Find: add \n (if windows encoding file) \r\n (if mac encoding)
- Add Replace: as "," (without the quotes).
- Click on REPLACE ALL! Thats it!
Output:
This is my Line 1,This is my Line 2,This is my Line 3,This is my Line 4,This is my Line 5
⛏️ Note: If you want to a space after each comma, just add a space after the comma ", " in Replace.
Let's me give you a gif demo to make it easy to follow,

How to replace new line with comma in Sublime Text
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