Why not show us what you are actually using rather than making us guess?

In general if you need to check if 'somethings' exist in a (large) 'something' else in Perl you tend to us a hash which is populated from the 'something' and keyed by potential 'somethings'. For example you could:

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

my %words;

while (defined (my $line = <DATA>)) {
    ++$words{lc $_} for $line =~ /(\w+)/g;
}

printf "There are %d occurences of '%s'\n", $words{lc $_}, $_
    for grep {exists $words{$_} && $words{$_} > 1} qw(text i);


__DATA__
hi monks
Happy new year to everyone
i have any array with me say @arr which contains number of words(may c
+ontain
spaces) and i also have a text (in array) which contains a text of say
+ 1000
lines. i need to do
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which prints:

There are 2 occurences of 'text'
There are 3 occurences of 'i'
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