line 1 have some string here and Hash_key_4: Hash_value_4_identical_to_Hash_value_9
line 2 have some string here and Hash_key_5: Hash_value_5
line 3 have some string here and Hash_key_6: Hash_value_6
line 4 have some string here and Hash_key_7: Hash_value_7_identical_to_Hash_value_2
line 5 have some string here and Hash_key_1: Hash_value_1
line 6 have some string here and Hash_key_2: Hash_value_2_identical_to_Hash_value_7
line 7 have some string here and Hash_key_3: Hash_value_3
line 8 have some string here and Hash_key_8: Hash_value_8
line 9 have some string here and Hash_key_9: Hash_value_9_identical_to_Hash_value_4
line 10 have some string here and Hash_key_10: Hash_value_10
....
....

##</code><code>##

Hash_key_1 => Hash_value_1
Hash_key_2 => Hash_value_2_identical_to_Hash_value_7
Hash_key_3 => Hash_value_3
Hash_key_4 => Hash_value_4_is_identical_to_Hash_value_9
Hash_key_5 => Hash_value_5
Hash_key_6 => Hash_value_6
Hash_key_7 => Hash_value_7_identical_to_Hash_value_2
Hash_key_8 => Hash_value_8
Hash_key_9 => Hash_value_9_is_identical_to_Hash_value_4
Hash_key_10 => Hash_value_10
....
....

##</code><code>##

my %hash = ();
my $filename = "input_text.txt";
open FILE,"<$filename" or die "Cannot read the file $filename: $!\n";

foreach <FILE> {
if (my $line =~ m/{$Hash_value{key}}/) {
       print "$line has $hash{$key} and value is $hash{key}\n";
    }
}