use strict;
use warnings;

use feature qw{ say };

open my $dataFH, q{<}, \ <<__EOD__ or die $!;
JOB::HEREISASTRING
Something
StringA
StringB
StringC
StringD
Something Else
StringE
StringF
StringG
StringH
JOB::HEREISANOTHERSTRING
Something
StringI
StringJ
StringK
StringL
Something Else
StringM
StringN
StringO
StringP
__EOD__

chomp( my @cleared = <$dataFH> );
close $dataFH or die $!;

my $flag;
foreach my $item ( @cleared )
{
    if ( $item =~ m{^JOB} )
    {
        say $item;
        next;
    }
    elsif ( $item !~ m{^String} )
    {
        $flag = $item;
        next;
    }
    else
    {
        say qq{~~$flag~~$item};
    }
}