Not the most elegant: 
use warnings;
use strict;

while (<DATA>) {
    chomp;
    if (/[^aeiou][aeiou]p$/i) {
        print "$_ match\n";
    }
    else {
        print "$_ no match\n";
    }
}

__DATA__
carp
step
tip
stoop
steep
asp
food
mop
up

[download]
prints: 
carp no match
step match
tip match
stoop no match
steep no match
asp no match
food no match
mop match
up no match

[download]
As you can see, the 2-letter up does not match. Is that ok? UPDATE: I like AR's solution better because it does match for up.

In reply to Re: Another regex to solve ... by toolic
in thread Another regex to solve ... by pat_mc

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