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Removing duplicate URL's from search cache

Posted on 1998-08-26
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Last Modified: 2010-03-04
I made a custom search script and I like to remove all the duplicate URLs that get mixed into the results.
My scripts returns via STDOUT:

Title:
Discription:
URL:

I am thinking I better combine title and URL together prior to sorting and dupe removal. I can sort it, just never seen anyting on dupe removal in any of the perl references I have, and not even sure what is the proper method for combining Titel & URL to a one line link.  
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Question by:Biffo
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Expert Comment

by:b2pi
ID: 1204545
I'm a little unsure what you're asking for, as it seems that there are
two different questions here.

1.) Removing duplicates and combining

Throw each URL into a hash.  For instance, if your search function
comes up with the following URL's

HTTP://www.abc.com/a.html
HTTP://www.def.com/b.html
HTTP://www.abc.com/a.html
HTTP://www.abc.com/c.html
HTTP://www.def.com/a.html

then you say something like

$title = '' unless defined($title);
$URLS{$url} = $title;

then any duplicate urls will disappear.

2.) Sorting, combining, etc.
To sort these by url, you can just

foreach (sort keys %URLS) {
   ## Do whatever you want
}

If you need to do that case-insensitive...
foreach (sort {uc($a) cmp uc($b)} keys %URLS) {
   ## Do whatever you want
}

Finally, if you want to sort by title...
foreach (sort {$URLS{$a} cmp $URLS{$b}} keys %URLS ) {
   ## Do whatever you want
}

I'll let you figure out how to do that last one with no regard to case

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Expert Comment

by:b2pi
ID: 1204546
Oh, well, that should have been an answer, nu?
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Author Comment

by:Biffo
ID: 1204547
This is how my results appear below, notice the title, brief discription and URL. As you can see, the results need a little formating to make them presentable :-)


1. (title: modperl Archive: Re: Problem Compiling Mod-Perl -- description: Problems Compiling Mod-Perl -- httpd...
http://outside.organic.com/mail-rchives/modperl/

2. (title: Perl 5 How-To,
description: Perl 5 How-To. The Definitive Perl Programming Problem-Solver. Author: Aidan Humphreys Mike Glover Ed Weiss Publishing Information Publication Date: May...,
http://www.techexpo.com/bookfair/macmillan/perl5ht.html

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Accepted Solution

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b2pi earned 190 total points
ID: 1204548
If what you're showing is what you want to parse, and those are each
coming in on one line....

 
#!/usr/bin/perl -w

use strict;

my($title, $desc, $url, %URLS);

while (<>) {
    m/title: (.*) description: (.*)(http:.*)$/;
    $title = $1;
    $desc = $2;
    $url = $3;
    $URLS{$url}->{title} = $title;
    $URLS{$url}->{desc} = $desc;
}

print "\n\n\nHere goes\n";
## This is sorted by url in a case sensitive way
my($i) = 0;
foreach (sort keys %URLS) {
    print $i++,".) URL:$_\n";
    print "\tTitle:\t$URLS{$_}->{title}\n";
    print "\tDescription:\t$URLS{$_}->{desc}\n";
}

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Expert Comment

by:b2pi
ID: 1204549
By the way, it's considered courteous to grade questions when you get
an answer.  (You have two ungraded questions right now, some effort
was put forth on your behalf because you requested it... it would seem
proper to at least acknowledge that effort)
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