Javascript Substr equivalent

Hi,

I would like to extract a portion of a string:

JS: "Hello world A \n Hello Universe B \n Hello Earth C\n"

AutoIt: "Hello world A {@CRLF} Hello Universe B {@CRLF} Hello Earth C {@CRLF}"

If i pass "Universe" to the function, I would like to get "B".

Javascript Code:

var str="Hello world A \n Hello Universe B \n Hello Earth C\n";
var param="Universe"
var pos = str.indexOf(param) +param.length ;
var n= str.substr(pos);
pos = n.indexOf("\n");
n = n.substr(0,pos);
 

<<n would return B>>

AutoIt code:

$str="Hello world A {@CRLF} Hello Universe B {@CRLF} Hello Earth C {@CRLF}"
$param="Universe"
$pos= StringInStr ($str, $param) + StringLen($param)
;todo
$pos2 = StringInStr($str, @CRLF) 
;todo

What would be a good equivalent here?

Thank You!