Re^3: splitting files into multiple sections to be processed as a file

[CountZero]

You can save the subcontents in an array, that is easy.

use Modern::Perl;
use Data::Dump qw/dump/;

my @subsections;
{
    local $/ = "\n\n";
    @subsections = <DATA>
}

say dump(@subsections);

__DATA__
subsection 1 line 1
subsection 1 line 2
subsection 1 line 3
subsection 1 line 4

subsection 2 line 1
subsection 2 line 2
subsection 2 line 3

subsection 3 line 1
subsection 3 line 2
subsection 3 line 3

subsection 4 line 1
subsection 4 line 2

But what file-specific operations do you want to perform on the subcontents?

Update: You can use a scalar reference as a "virtual" (or in-memory) file (since Perl v5.8.0.)

open my $fh, '<', \$subsections[1];

print while <$fh>;