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Full Discussion: Diffing words - percentages
Top Forums Shell Programming and Scripting Diffing words - percentages Post 302751995 by jim mcnamara on Saturday 5th of January 2013 08:18:11 AM
Old 01-05-2013
You want similarity algorithms

Here is a good article explaining one approach (it talks about java):
How to Strike a Match

Levenshtein distance may be the most likely candidate for you:
Levenshtein distance - Wikipedia, the free encyclopedia

Here is perl module wordnet::similarity
WordNet::Similarity - search.cpan.org

You have to download this module and part of the parent module, too. It gives examples. You will have to work out your percentage calculation using results from a module like this one. Or roll your own (article 1 above). I would recommend doing some reading (above) before messing with this. Similairity algorithms can do interesting and sometimes confusing things. IMO.
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URI::URL(3)						User Contributed Perl Documentation					       URI::URL(3)

NAME
URI::URL - Uniform Resource Locators SYNOPSIS
$u1 = URI::URL->new($str, $base); $u2 = $u1->abs; DESCRIPTION
This module is provided for backwards compatibility with modules that depend on the interface provided by the "URI::URL" class that used to be distributed with the libwww-perl library. The following differences exist compared to the "URI" class interface: o The URI::URL module exports the url() function as an alternate constructor interface. o The constructor takes an optional $base argument. The "URI::URL" class is a subclass of "URI::WithBase". o The URI::URL->newlocal class method is the same as URI::file->new_abs. o URI::URL::strict(1) o $url->print_on method o $url->crack method o $url->full_path: same as ($uri->abs_path || "/") o $url->netloc: same as $uri->authority o $url->epath, $url->equery: same as $uri->path, $uri->query o $url->path and $url->query pass unescaped strings. o $url->path_components: same as $uri->path_segments (if you don't consider path segment parameters) o $url->params and $url->eparams methods o $url->base method. See URI::WithBase. o $url->abs and $url->rel have an optional $base argument. See URI::WithBase. o $url->frag: same as $uri->fragment o $url->keywords: same as $uri->query_keywords o $url->localpath and friends map to $uri->file. o $url->address and $url->encoded822addr: same as $uri->to for mailto URI o $url->groupart method for news URI o $url->article: same as $uri->message SEE ALSO
URI, URI::WithBase COPYRIGHT
Copyright 1998-2000 Gisle Aas. perl v5.18.2 2012-02-11 URI::URL(3)
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