Can you solve your problem, sufficiently well, using a combination of regexes and procedural code?   One regular expression could, for example, locate all source lines in the document which contain “a vowel that is not immediately followed by another vowel,” leading to an if-statement in which the matching lines are further examined by whatever means seem appropriate.

Sure, “regex golf” is instructive.   It can even be entertaining.   But it can also devolve into a waste of time...