Could someone explain how /^\s+|\s+$/g selects whitespace

Could anyone explain the /^\s+|\s+$/g in detail
I am trying to understand the solution but for some reason I just cannot wrap my head around this one. I would like to know how does the code /^\s+|\s+$/g selects whitespace.

Your code so far

let hello = "   Hello, World!  ";
let wsRegex = /^\s+|\s+$/g; // Change this line
let result = hello.replace(wsRegex,""); // Change this line

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36

Challenge: Remove Whitespace from Start and End

Link to the challenge:

Could you explain a little more about what you don’t understand?

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