Match Characters that Occur Zero or More Times Explanation please

JavaScript
1

Tell us what’s happening:
Why do I have to put “A” and then a “a”?
Why I can’t just write /a*/

Your code so far


let chewieQuote = "Aaaaaaaaaaaaaaaarrrgh!";
let chewieRegex = /Aa*/; // Change this line
let result = chewieQuote.match(chewieRegex);
console.log(result);

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/regular-expressions/match-characters-that-occur-zero-or-more-times

2

in this way you are matching an upper case A followed by zero or more lower case a
it is the only way to match the required string and to not match the strings you should not match