Regular Expression challenge

please help me with this challenge it does not pass
here is my code

let quoteSample = "The quik brown fox jumps over the lazy dog.";
let alphabetRegex = /[a-z] /gi; // change this line
let result= quoteSample.match(alphabetRegex); // change this line

https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/regular-expressions/match-letters-of-the-alphabet/

should i add capital letters => [a-zA-Z]

amazing! thank you @camperextraordinaire