regex - How to match the pattern regardless of the number of whitespaces -

not in regexp, how can match pattern regardless of how many whitespaces there is?

var pattern = / void main$/;  //here  var pool1 = "abdodfo void main"; var pool2 = "abdodfo   void     main";  console.log(pattern.test(pool1)); //  true console.log(pattern.test(pool2)); //  must true 

change pattern to: /\s+void\s+main$/