Match All Letters and Numbers-- what exactly the function of "gi" in this question

I search on the stackoverflow but still didnt’t understand the message
Tell us what’s happening:

Your code so far

let quoteSample = "The five boxing wizards jump quickly.";
let alphabetRegexV2 = /\w/gi; // Change this line
let result = quoteSample.match(alphabetRegexV2).length;

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36.

Link to the challenge:

What message do you not understand?

the “gi” part…I created this post just for this “gi” part. I’ve read other answer but couldn’t understand much.

g stands for global. It means it will search everything. The i stands for case insenstitive. meaning it will ignore the case in the search and find both capital and non capital letters.

It’s @Tirjasdyn said, but note that the i is unnecessary here: \w finds and word character, upper or lower case.