Push a readme.md to confluence using confluence APIs

Let's say this is the readme I want to update :

## Test description 
 This test verifiy : 
 - lorem text

The error is that what the API expects from a readme is :

## Test description \n This test verifiy :\n - lorem text

So from my groovy script I tried to put it in the request.

{
   "id" : "${Properties#pageId}",
   "type" : "page",
   "status" : "current",
   "title" : "Markdown test",
   "body" : {
     "storage" : {
         "value" : "<ac:structured-macro ac:name=\"markdown\" ac:schema-version=\"1\" ac:macro-id=\"1234\"><ac:plain-text-body><![CDATA[${Properties#body}]]></ac:plain-text-body></ac:structured-macro>",
         "representation" : "storage",
         "_expandable" : {
            "content" : "/rest/api/content/${Properties#pageId}"
         }
     }
   },
   "version":{"number":${Properties#pageVersion}}
}

With :

def carriageReturn= '\\n '
fileContents = fileContents.replaceAll('\n',carriageReturn).replaceAll(' \r',"")

Except '\\n' is interpreted as the a carriage return when i want it to be litteraly '\n'