用字符串+ JavaScript中的单行替换多行

Question

I am trying to replace all multiplines with single line in a string in javascript but none is working . Below is my code :

var str=inputList.replace(/\n/gm,"\n");

input eg

abc,def <3 newlines>


xyz <1 newline>
opp

Expected output:

abc,def <1 newline>
xyz
opp

Actual output:

abc,def<3 newlines>


xyz<1 newline>
opp

Any help is appreciated.

Answer 1

(Edit : simplified version thanks to stribizhev)

If you are trying to replace two or more \\n with one, try this :

var str = inputList.replace(/\n{2,}/gm,"\n");

{2,} means 2 or more

Answer 2

You are replacing \\n with \\n in your code.

Instead do:

var str = inputList.replace(/\n/gm, "");

Answer 3

You are matching just one and replacing it with one. I believe if you just add the + after the \\n to match one or more. If you do not want to match just one use {2,} to match two or more.

var str=inputList.replace(/\n+/g,"\n");
                             ^

or

var str=inputList.replace(/\n{2,}/g,"\n");
                             ^^^^