I'd suggest that you start with one string at a time until you
know more about what you are trying to do.
List::AllUtils would be a good place to start. "delete" is
trivial, so I leave that to you.
#!/usr/bin/perl
use autodie;
use strict qw/refs/;
use warnings FATAL => 'all';
use List::AllUtils qw/:all/;
my (@arr) = qw( is an to for from );
my $str1 = ("This is not true");
print "At least one value is undefined\n"
if all sub {
defined $_
}, @arr;
printf "\t %i item(s) is(are) defined ", true { defined $_ } $str1;
print "\n";
print "\t The defined element is: before_incl { defined $_ } @arr";
print "\n";
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