#!/usr/bin/perl

# http://perlmonks.org/?node_id=1199646

use strict;
use warnings;
use Path::Tiny;

local $/ = "\nEnd";
while(<DATA>) # read section to (and including) End
  {
  $_ .= do { local $/ = "\n"; <DATA> }; # complete last line
  /\nEnd (\d+).*$/ and path("OUTFILE$1")->append($_);
  }

__DATA__
Start:/abc/def
.....
End 1.2
Start:/xyz/uvw
.....
End 2.8