Decompose ANSI X12 transmission into individual documents.

use strict;
use warnings;
use Data::Dumper;

my $ediFile = shift;
my ($contents,$delim,$term,$txnCount,@transactions);
{ $/ = undef;
  open my $ifh,'<',$ediFile;
 $contents = <$ifh>;
}
($delim,$term) = $contents =~ m/^ISA(.).{101}(.)/;
$delim = quotemeta($delim);
@transactions = $contents =~ m/(ST$delim.+?SE$delim\d+$delim\d+$term)/
+gs;
($txnCount) = $contents =~ m/${term}GE$delim(\d+)/;
die "Parse error - transaction counts wrong"
  if ($txnCount != scalar @transactions);

foreach my $transaction (@transactions) {
  # put into useful form for processing
  my @segments = split /$term/,$transaction;
  my ($segCount) = $transaction =~ m/${term}SE$delim(\d+)/;
  die "Parse error - segment counts wrong"
    if ($segCount != scalar @segments);
  my ($process_this);
  map { push @$process_this, [split /$delim/,$_] }
    @segments;
  print Dumper(\$process_this);
}
[download]

EDI File:

ISA*00*          *00*          *02*AAAA           *01*123456789      *
+160921*075
1*U*00401*000099836*0*P*:~GS*FA*AAAA*123456789*20160921*0751*99836*X*0
+04010~ST*9
97*998360001~AK1*SM*7311~AK9*A*1*1*1~SE*4*998360001~ST*997*998360002~A
+K1*SM*7312
~AK9*A*1*1*1~SE*4*998360002~GE*2*99836~IEA*1*000099836~
[download]

Output:

$VAR1 = \[
            [
              'ST',
              '997',
              '998360001'
            ],
            [
              'AK1',
              'SM',
              '7311'
            ],
            [
              'AK9',
              'A',
              '1',
              '1',
              '1'
            ],
            [
              'SE',
              '4',
              '998360001'
            ]
          ];
$VAR1 = \[
            [
              'ST',
              '997',
              '998360002'
            ],
            [
              'AK1',
              'SM',
              '7312'
            ],
            [
              'AK9',
              'A',
              '1',
              '1',
              '1'
            ],
            [
              'SE',
              '4',
              '998360002'
            ]
          ];
[download]