Javascript Regular Expressions Match word start and end

let cookbookString = new Array();

cookbookString[0] = "Joe's Cooking Book";
cookbookString[1] = "Sam's Cookbook";
cookbookString[2] = "JavaScript CookBook";
cookbookString[3] = "JavaScript BookCook";
cookbookString[4] = "cookBook BookCook";
cookbookString[5] = "COOKBOOK cookbook";

// search pattern
let pattern = /Cook.*Book/;
for (let i = 0; i < cookbookString.length; i++){
  console.log(cookbookString[i] + " " + pattern.test(cookbookString[i]));
}