Match Single Character with Multiple Possibilities: why passing without 'u'

Tell us what’s happening:

Your code so far


let quoteSample = "Beware of bugs in the above code; I have only proved it correct, not tried it.";
let vowelRegex = /[a,e,i,o,]/gi; // Change this line
let result = quoteSample.match(vowelRegex); // 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/67.0.3396.99 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/regular-expressions/match-single-character-with-multiple-possibilities

ohhh…i got it it was supposed to be withut commas or space