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

my $string = <<EOF;
-----------------------------------------------------------
ISSUE ABCDE00078945
-----------------------------------------------------------

Summary : summary about the issue

Component : Component desscription
Product : Product name
Version : Version number
Date : 2013-10-15

-----------------------------------------------------------
ISSUE ABCDE00012345
-----------------------------------------------------------

Summary : summary about the issue

Component : Component description
Product : Product name
Version : Version number
Date : 2014-10-15

The above pattern will be containing special characters.
Each set of "ISSUE" i e.,
-----------------------------------------------------------
ISSUE ABCDE00078945
-----------------------------------------------------------

Summary : summary about the issue

Component : Component desscription
Product : Product name
Version : Version number
Date : 2013-10-15
EOF

while($string =~ /(ISSUE\s+\w{5}\d+)\n-*\n\s*([\S\s]*?)---*/gs) {
    print "$1\n";
}