#!usr/bin/perl -w
use strict;

my @strings = glob "{abc}{0,p,z}"; #to enumerate the combinations

print "@strings\n"; #abc0 abcp abcz
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You can make a regex out of these combinations, $regex=join("|",@strings); or what you had is fine  /abc[0pz]/

note: that abc or the character set 0pz could be Perl variables ($prefix or $endingLetters or whatever).

my $prefix = 'abc';
my $endingLetters = '0pz';
if (/$prefix[$endingLetters]/){...}
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