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Asked: 2026-05-25T03:40:53+00:00

I need to extract the largest values(number) of specific names from a webpage. consider

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I need to extract the largest values(number) of specific names from a webpage. consider the webpage as 

 http://earth.wifi.com/isos/preFCS5.3/upgrade/

and the URL content is

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html>
 <head>
  <title>Index of /isos/preFCS5.3/upgrade</title>
 </head>
 <body>
<h1>Index of /isos/preFCS5.3/upgrade</h1>
<table><tr><th><img src="/icons/blank.gif" alt="[ICO]"></th><th><a href="?C=N;O=D">Name</a></th><th><a href="?C=M;O=A">Last modified</a></th><th><a href="?C=S;O=A">Size</a></th><th><a href="?C=D;O=A">Description</a></th></tr><tr><th colspan="5"><hr></th></tr>
<tr><td valign="top"><img src="/icons/back.gif" alt="[DIR]"></td><td><a href="/isos/preFCS5.3/">Parent Directory</a></td><td>&nbsp;</td><td align="right">  - </td></tr>
<tr><td valign="top"><img src="/icons/unknown.gif" alt="[   ]"></td><td><a href="GTP-UPG-LATEST-5.3.0.160.iso">GTP-UPG-LATEST-5.3.0.160.iso</a></td><td align="right">29-Aug-2011 16:06  </td><td align="right">804M</td></tr>
<tr><td valign="top"><img src="/icons/unknown.gif" alt="[   ]"></td><td><a href="GTP-UPG-LATEST-5.3.0.169.iso">GTP-UPG-LATEST-5.3.0.169.iso</a></td><td align="right">31-Aug-2011 16:26  </td><td align="right">804M</td></tr>
<tr><td valign="top"><img src="/icons/unknown.gif" alt="[   ]"></td><td><a href="GTP-UPG-LATEST-5.3.0.172.iso">GTP-UPG-LATEST-5.3.0.172.iso</a></td><td align="right">01-Sep-2011 16:26  </td><td align="right">804M</td></tr>
<tr><td valign="top"><img src="/icons/unknown.gif" alt="[   ]"></td><td><a href="PRE-UPG-LATEST-5.3.0.157.iso">PRE-UPG-LATEST-5.3.0.157.iso</a></td><td align="right">29-Aug-2011 16:05  </td><td align="right">1.5G</td></tr>
<tr><td valign="top"><img src="/icons/unknown.gif" alt="[   ]"></td><td><a href="PRE-UPG-LATEST-5.3.0.165.iso">PRE-UPG-LATEST-5.3.0.165.iso</a></td><td align="right">31-Aug-2011 16:26  </td><td align="right">1.5G</td></tr>
<tr><td valign="top"><img src="/icons/unknown.gif" alt="[   ]"></td><td><a href="PRE-UPG-LATEST-5.3.0.168.iso">PRE-UPG-LATEST-5.3.0.168.iso</a></td><td align="right">01-Sep-2011 16:26  </td><td align="right">1.5G</td></tr>
<tr><th colspan="5"><hr></th></tr>
</table>
<address>Apache/2.2.3 (Red Hat) Server at earth.wifi.com Port 80</address>
</body></html>

In the above source you can see 172 is the largest for GTP-UPG-LATEST-5.3.0
and 168 is the largest for PRE-UPG-LATEST-5.3.0

How can I extract these values and put it to a varialble say $gtp and $pre in perl

Thanks so much in advance

#!/usr/bin/perl 

use strict;
use warnings;

use LWP::Simple; 

my $upgrade = 'http://earth.wifi.com/isos/preFCS5.3/upgrade/';
my $website_content = get($upgrade);
if ( $website_content =~ /href=\"PRE-UPG-LATEST-5.3.0(.*?)\.iso\"/ ) 

{

my $preversion = ${1};

print $preversion;
}

This is the code I tried with but its not getting the largest value. This is code is getting the first PRE-UPG-LATEST version value that it encounters . But I need the largest of the value

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1 Answer

  1. Editorial Team

    An if() executes only once. Since you want to get many, you need a loop

    while ( m//g ) {

    In your data it has “UPG” but your regex has “UGP”, so it won’t match
    (you should copy/paste long strings rather than (attempt to) retype them!).

    This will list the data you need, I’ll leave it to you to figure out how to process it.

    while ($website_content =~ /href="((?:PRE|GTP)-UPG-LATEST-.*?)\.(\d+)\.iso"/g) {
    my($file, $version) = ($1, $2);
    print "file=$file version=$version\n";
}
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