#!/usr/bin/perl --
use strict; use warnings;
use Data::Dump;

my $blah = '    VAR DS 0D
        DC    AL1(045),AL2(286),AL2(117),AL2(290)';

my ( $top, $bottom ) = split /[\r\n]+/, $blah;
print "$top\n";

#~ my( $prefix, @biscuits ) = grep length, split /[\s,]+/, $bottom;
#~ my( $prefix, @biscuits ) = split /(?:(?<!^)\s+)|,/, $bottom;
#~ my( $prefix, @biscuits ) = split /(?:(?<!^)\b\s+)|,/, $bottom;
#~ my( $prefix, @biscuits ) = split /(?:(?<!\A)\b\s+)|,/, $bottom;
my( $prefix, @biscuits ) = $bottom =~ /(^\s+\S+)|([^\s\(]+\([^\s\)]+\))/g;

dd \$prefix, \@biscuits ;

for my $tack ( @biscuits ){
    print "$prefix $tack\n";
}
__END__
$ perl shineon004
Use of uninitialized value $tack in concatenation (.) or string at shineon004 line 20.
Use of uninitialized value $tack in concatenation (.) or string at shineon004 line 20.
Use of uninitialized value $tack in concatenation (.) or string at shineon004 line 20.
Use of uninitialized value $tack in concatenation (.) or string at shineon004 line 20.
Use of uninitialized value $tack in concatenation (.) or string at shineon004 line 20.
    VAR DS 0D
(
  \"        DC",
  [
    undef,
    undef,
    "AL1(045)",
    undef,
    ",AL2(286)",
    undef,
    ",AL2(117)",
    undef,
    ",AL2(290)",
  ],
)
        DC 
        DC 
        DC AL1(045)
        DC 
        DC ,AL2(286)
        DC 
        DC ,AL2(117)
        DC 
        DC ,AL2(290)