Perl: how to split a file?
*****3123123*****RAW
text1
text2
*****2312354***RAW
text3

*****3123123*****RAW
text1
text2

*****312312354***RAW
text3

open FILE, "<file";
@file= <FILE>;
close FILE;
@lines = split (/(RAWn)/, "@file");
foreach $value (@lines) {
  if ($value =~ /[a-z]|[A-Z]|[1-9]/)  {
    print ("$valuen");
  }
}

*****3123123*****RAW

 text1
 text2

*****312312354***RAW

 text3

*****3123123*****RAW
 text1
 text2

 *****12354***RAW
 text3

use strict;
use warnings;

@ARGV or die "Input file required as command-line parametern";

my $out;

while (<>) {
  if ( /(d+)*+RAW$/ ) {
    open $out, '>', "$1.out" or die $!;
    select $out;
  }
  print $_ if $out;
}

use strictures;
use File::Slurp qw(read_file write_file);
my $raw = read_file('raw.txt', binmode => ':raw');
my $header = qr/^ (?= [*]+ [0-9]+ [*]+ RAWn)/msx;
my @chunks = split $header, $raw;
# (
#     "*****3123123*****RAWntext1ntext2n",
#     "*****2312354***RAWntext3"
# )
for my $i (1..@chunks) {
    write_file("File$i.txt", {binmode => ':raw'}, $chunks[$i-1]);
}

#!usr/bin/perl
my $fi, $fi2;
my $line;
my $i;
my @lines;
my @filenameparts;
my $filename = "file_1.txt";

open($fi, "< original.txt");
@lines = <$fi>;
open ($fi2, " > $filename");

foreach (@lines)
{
if (($i > 0) and $_ =~ /RAW/)
{
    @filenameparts = split("_", $filename);
    foreach (@filenameparts)
    {
        print "Woooo".$_;
    }
    @filenameparts[1] = substr(@filenameparts[1], 0, @filenameparts[1].length() - 5);
    @filenameparts[1] = ($filenameparts[1] + 1);
    $filename = @filenameparts[0]."_".@filenameparts[1].".txt";
    print $filename;
    close($fi2);
    open ($fi2, " > $filename");
    $i = 0;
    print $fi2 $_;

}
else
{
    print $fi2 $_;
}
$i++;

}