Ruby's regular expression, which you want to store in an array every time a specific string is included.

I would like to use Ruby's regular expression to determine that a particular string (for example, vowel [aiueo]) is stored in an array whenever the String string contains a specific string.How should I describe it?
Below is an example of input and output.

"sayounara"
>["sa", "yo", "u", "na", "ra"]