my $line = 'DATA/-/data123/data456//data789/-/AZ';
my @fields = split '/', $line;

##</code><code>##

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

my %keys = ('DATA' => 1);        # setup a hash of keywords

my $line = 'DATA/-/data123/data456//data789/-/AZ';
my @fields = split '/', $line;   # split line into fields on a slash
if( $keys{$fields[0]} ){         # is the first element in my hash of keywords
    my $keyword = shift @fields; # remove the keyword from the fields array
    if( grep { $_ eq '' or $_ eq '-' } @fields ){   # are any elements empty or a dash?
        say "Line has problems, keyword $keyword";
    }
}