A hash associates one key with one value, so this is what you have in %hash

my $str='finding related pages on the world wide web the web';
my %hash=split(/\s+/,$str);
use DDS; Dump( \%hash );
__END__
$HASH1 = {
           finding => 'related',
           pages   => 'on',
           the     => 'web',
           wide    => 'web'
         };
[download]

Hi,

#! /usr/bin/perl

use strict;
use warnings;

 my $str1='It is a guide to action which ensures that the military alw
+ays obey the commands of the party.'; chomp($str1);

my $str2='It is a guide to action that ensures that the military will 
+forever heed Party commands is a guide.'; chomp($str2);



my @arr1=split(/\s+/, $str1);

my $n_occur_in_str1=0;

my $n_occur_in_str2=0;

print "-"x60,"\n";
print "nth Match\tNo of occurence\t\tMatched Pattern\n";

print "-"x60,"\n";



for(my $i=0; $i<$#arr1;$i++) {

       my  $t1="$arr1[$i] $arr1[$i+1] $arr1[$i+2]";

        my  @pattern_word_count=split(/\s/, $t1);

        my $space_count=@pattern_word_count;

        if($space_count == 3) {

                if($str2=~/$t1/) {

                     my   $occurence=`echo $str2 | grep -o '$t1' |wc -
+l`; chomp($occurence);

 print $i+1,"\t\t",$occurence,"\t\t\t$t1\n";

                        $n_occur_in_str2+=$occurence;

                        $n_occur_in_str1++;

                }

        }

}



print "\n\nTotal no of occurence in str1 : $n_occur_in_str1\n";

print "\n\nTotal no of occurence in str2 : $n_occur_in_str2\n";
[download]

in the above code i used an array to store the splitted words from sentence and then use each words for further processing

Here, the problem is when i have repeated words, unwantedly i do computation for same words. so to avoid tat i have been advised to store the words in a hash rather than an array.

But, i m not clear how i can do that

in the above code i used an array to store the splitted wor

Oh, now I remember, this is Comparison between keys in hash all over again

Ask yourself why anyone would help someone who 1) ignores their advice 2) ignores their questions 3) repeat the same thing, repeatedly?

I tried to help you before, but every time its either like pulling teeth or like talking to a wall