I need to find set of words that contain vowels occurring in aeiou order.No need to occur consecutively. Also allowing each vowel to occur multiple times before the occurence of the next, but never occurring again after the next vowel has occurred  basic input list -   so far I used these regex  grep 'a[^eiou]*e[^aiou]*i[^aeou]*o[^aeiu]*u[^aeio]*' words2.txt - this is the closest one that I got  grep 'a[^e^i^o^u]*e[^a^i^o^u]*i[^a^e^o^u]*o[^a^e^i^u]*u[^a^e^i^o]*' words2.txt  grep 'a.*e[^a]*i[^ae]*o[^aei]*u[^aeio]*' words2.txt    And some outputs from first one -   appenditious,appetitious,arenicolous,arreptitious,arsenious  ....  ultraexpeditious,ultrareligious,unfacetious   most of my outputs will satisfied the conditions but some of them are not. e.g. - ultraexpeditious because when u occurs after that there cannot be have any vowel in the word.
I have a large dictionary file with 300,000+ words in it and I'm trying to find all words with the vowels aeiou in that order and have only exactly 5 vowels. My current attempt does not seem to be working and for the life of me I don't understand why.  less mywords | grep -iE [^aeiou]*a[^aeiou]*e[^aeiou]*i[^aeiou]*o[^aeiou]*u[^aeiou]*   I think it get's all the words I'm looking for but there are a few words that pop up which I can not get rid of.  abstemiousnesses ultraserious   There are a few other but they are in the same vein. Curiously, even if I add something like [^u]* to the front ultraserious keeping popping back up! Any solution would be fine however I would like it restricted to grep as we've been told it can be done using only grep.
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