old_contents: "use strict";
  
  /**
   * Tests if the string contains vowels
   * 
   * @returns {Boolean}
   */
  Object.defineProperty(String.prototype, "hasVowels", {
      value () {
  
          const matchRegex = new RegExp("[aeiou]","i");
          return matchRegex.test(this);
  
      }
  });
  
new_contents: "use strict";
  
  /**
   * Tests if the string contains vowels
   * 
   * @returns {Boolean}
   */
  Object.defineProperty(String.prototype, "hasVowels", {
      value () {
  
          return /[aeiou]/ig.test(this);
  
      }
  });
  
subject: refactor hasVowels for length