first:
this:that
here:there
when:what
how:where
now:later

second:
this:that
here:there
when:what
how:where
now:later

##</code><code>##

use strict;
use warnings;
use Data::Dumper;
my $file = "new_testfile.txt";
my $testhashref;
open (my $fh, "<",$file) or die "Can't open open file $file:$!"; 

{

	local $/ = "";
	while (my @records = <$fh>) {
		foreach my $line (@records) {
			next if $line =~ /^[a-z]+:$/m;
			print "$line";
		}
   }
}


##</code><code>##

pritesh@pavilion:~/perlscripts$ perl test.pl
pritesh@pavilion:~/perlscripts$ 

##</code><code>##

pritesh@pavilion:~/perlscripts$ perl test.pl
first:
this:that
here:there
when:what
how:where
now:later

second:
this:that
here:there
when:what
how:where
now:later