So using grep to return something other than a subset of the original list is quite restricted and is probably an indication that you shouldn't be using grep. (:

I have been guilty of writing

do_something() if (grep /something/, @array);
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is this a "wrongly" used grep? Should I be writing something like-

foreach (@array){
    &do_something() and last if /something/;
}
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... the grep seems easier on the eye IMO. Is it OK if you know the data source is always going to be small?