• open a file
• read a series of records from the file (No guaranteed unique field, so perhaps an array of arrays? or an array of hashes might be more suitable)
• Print a fixed field width record from each array entry.

And what have you tried? What isn't working as you expected?

Actually i m trying to extract data from a text file.. but i m not able to do so.. kindly help me :(

I'm sure your teacher gave you some pointers. Start with those, then have a look at what your textbook has to say on the matter.

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This should extract your data, if I understand your input file format correctly (please, read the links that were kindly provided to you and format the post before you post it).

#!/usr/bin/perl -w
use strict;

my @records;
my %record;
my $recordinprogress = 0;

while (<>) {
    if (/-------/) {
        if ($recordinprogress) {
            push @records, { %record };
            %record = ();
            $recordinprogress = 1;
        }
    }
    elsif (/([^:]+): (.*)/) {
        $recordinprogress = 1;
        $record{$1} = $2;
    }
}
[download]

The code above, when used on your data, produces the following array of hashes:

$VAR1 = [
          {
            'phone no' => '34738472 ',
            'url' => 'www.google.com ',
            'name' => 'Umesh ',
            'address' => 'New Delhi ',
            'room no' => '001 '
          },
          {
            'phone no' => '',
            'url' => 'www.yahoo.com ',
            'name' => 'Raj ',
            'address' => 'Sahadara ',
            'room no' => '002 '
          },
          {
            'phone no' => '84398419 ',
            'url' => 'www.rediff.com ',
            'name' => 'Hem ',
            'address' => 'mumbai ',
            'room no' => '003 '
          },
          {
            'phone no' => '',
            'url' => 'www.google.com ',
            'name' => 'Mukesh ',
            'address' => '',
            'room no' => '004 '
          },
          {
            'phone no' => '4814314783 ',
            'name' => 'abcxyz ',
            'address' => '',
            'room no' => ''
          },
          {
            'phone no' => '',
            'name' => 'Rakesh ',
            'address' => 'jrieiqrjqq ',
            'room no' => ''
          }
        ];
[download]

Now, it's up to you to print it out. I suggest using CSV if you want to import the data to an application like Gnumeric or Excel.

If you have any further questions, show something that you managed to do. You'll find many Monks willing to help you, but that does not mean someone will do everything for you.

Alternatively, you could set the input record separator ($/) to "-------", which simplifies things a bit:

$/ = "-------\n";
my @records;

while (<>) {
    my @entries = map { /([^:]+):\s*(.*)/ } split /\n/;
    push @records, { @entries } if @entries;
}
[download]