Reg Exp that verifies that the first and last letter of a string are vowels and that others are the same vowel

I was making a regExp with the condition of the title: Word that begins and ends in a vowel and both are the same, I have this regExp:

    let re = new RegExp('^[aeiou]*?=$[aeiou]');

The letters between the first and last (if any) do not matter if they are consonants.

It doesn't work, I don't know what I might be missing, this string abcdadoesn't accept it and it should be valid...