I've not done much testing but this seems to work by putting the capture in the look-behind.

knoppix@Microknoppix:~$ perl -E '
> for ( qw{ soap creep top groat loop } )
> {
>     say unless m{(?<=([aeiou]))\1p\z};
> }'
soap
top
groat
knoppix@Microknoppix:~$
[download]

I hope this is helpful.

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