text: // Regular Expressions: Match Letters of the Alphabet
  
  /*
  Inside a character set, you can define a range of characters to match using a hyphen character: -.
  
  Example:
  let catStr = "cat";
  let batStr = "bat";
  catStr.match(bgRegex); // Returns ["cat"]
  batStr.match(bgRegex); // Returns ["bat"]
  */
  
  //Match all the letters in the string quoteSample.
  
  let quoteSample = "The quick brown fox jumps over the lazy dog.";
  let alphabetRegex = /[a-z]/gi; // Change this line
  let result = quoteSample.match(alphabetRegex); // Change this line
  
  console.log(result);