CS2121 lab exercise 1 part a12 - hint

What is required is a pattern of the form: A...E...I...O...U
where A, E, I, O, U indicate patterns that recognise the corresponding vowels, and the "..."s indicate patterns that recognise whatever is allowed between the vowels i.e. "any other vowels and letters etc."
Try thinking about the problem again. Start by thinking about what you want to achieve and how you might go about achieving it.

If you are still stuck, it may help you to look at the hint for part a7.

I am assuming that by this stage you will be reasonably familiar with how to write down regular expressions - if not, look back at the previous parts.