Replace new lines and make it all one line in java

Question

I want to split these new lines into one line replace them with commas.

output now=

 s = Ar,TB,YY 
    
    0,2022323,02
    
    0,223233,29

output I want:

s = Ar,TB,YY,0,2022323,02,0,223233,29;

I tried using s = s.replaceAll("\n", ","); , didnt seem to make a difference.

I can't see how you could have that string declaration even compile. If it's due to editor wrap, it won't have line separators in it — g00se, May 26 '22 at 19:17
As @OldProgrammer said, post a minimal reproducible example please. — Tintin, May 26 '22 at 19:21
While it's a two-step approach, how about `replaceAll("\n+", "\n")`, followed by `replaceAll("\n", ",")`? It's a cost of performance for the simplicity of writing. — Rogue, May 26 '22 at 19:24
In your example bottom lines also have additional spacing on the left. Are those spaces part of string, or perhaps code indentation? — Pshemo, May 26 '22 at 19:37

Pshemo · Answer 1 · 2022-05-27T09:16:21.157

2

Since Java 8 we can use in regex \R which represents line separator which aside from \n can also be \r, or \r\n pair and more.

So your code can look like

s = s.replaceAll("\\R+", ",");

"\\R" to represents \R in regex
+ to match one or more line separator, in case you want to remove more than one empty lines with single comma ,

edited May 27 '22 at 09:16

answered May 26 '22 at 19:35

Pshemo

1 Answers1