How to match empty lines with JavaScript regular expression

Question

I have a string as follows.

var str = `
   hello
   world 
   
   hi
   good
`;

There is a blank line between world and hi. I want to split the blank line to get an array. How to achieve this? Tried this and it didn't work.
str.split(/^\r|\r\n|\n$/);

Answer 1

var str = `
hello
world 

hi
good
`;
str.split(/\n\n|\r\r|\r\n\r\n/);

Answer 2

var str = `
   hello
   world 
   
   hi
   good
`;

str.split(/\n\s*\n/g);