Question

I am trying to formulate a regex expression (running in Python) that gets passed a word and needs to only find words that do not contain 2 adjacent vowels. For Example:

me - would match
mee - would not match
meat - would not match
base - would match
basketball - would match

I am lost here as I do not know how to check for something that does not exist?

Thanks for the help

Answer 1

m = re.match(r"(?:[^euioa]|[euioa](?![euioa]))*$", word)

@Tichodroma’s answer is simpler and therefore should be preferable if you can negate the match in the code later i.e., just write if not m where you would write if m with this solution.