This will depend a lot on how you define each format -- exactly what qualifies as an apartment number, and what qualifies as a phone number? Some apartment numbers have letters, for instance: Apt. #54a. But from your description, it sounds like you want to catch things like Apt. 302, but not 302-4321. In that case, you could grab all 3-4 digit strings that are not preceded or followed by a dash:

#!/usr/bin/env perl
use 5.010; use strict; use warnings;

my $field = 'Apt.302. 123-4567. 4021'; # from database record
$field = " $field ";                   # pad it
while($field =~ /[^\d-](\d\d\d\d?)[^\d-]/g){
    say "Apartment: $1";
}
[download]

I'd guess for real-life data, you'll have to get fancier than that, but that may get you headed in the right direction.

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