Thank you !

1. "Y" is not counted as a vowel (see description)
2. You don't need commas in the square brackets in the regex
3. Your code will return an error if there are 0 matches. This is because str.match() will return null if no matches are found, then your code attempts to find null.length which leads to the error (null has no length)

add more ditails about task

Yes , I wrote solution that works in Browser but doesn't in this application, What's up ?