Remove vowels in string from position 4 onwards

Dont know if i should make a new topic or not but:

Instead of replacing all vowels of a kind in case the string is to long, i would like to replace every vowel after position 5 then 4 ... to reduce the string length.

After spending the day with regex tutorials: i just dont get it. or the tutorials suck. or both.

So from what i gathered this:

should put the first 4 letters as string1 and then all following nonvowel letters as string2 and enter them into the field.
but it does nothing.
What am i doing wrong?

never mind
i managed to come up with a working solution:

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