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Your approach does n^2 comparisons with n=(number of words in list). I took a different aproach of sorting the list then comparing each word only with the following words in the array. This cuts the comparisons by half when n gets large as in this case. I'm curious how grep with the regex will stand up against your approach.

As for the extra overhead for sorting the word list my guess is the extra sorts at the beginning pay off as n gets large. What do you think? I have been wanting to try out benchmarking for some time after seeing you use it so much. This could be a good opportunity.

use warnings; use strict; open LOG, ">", 'wordsinwords_LOG.txt' or die $!; #Sort alphabetically first so identical words end up together. chomp (my @words = sort { length($a) <=> length($b) } sort <DATA>); @words = map {lc} @words; for (my $i=0; $i<$#words; $i++) { my $word = $words[$i]; next if $word eq $words[$i+1]; my @matched = grep {/$word/ and $_ ne "${word}s" and $_ ne "${word +}'s" } @words[$i+1..$#words]; print LOG "$word => @matched\n" if @matched; } __DATA__ at Ate crate tree Trip tread read ad at ads crate's

Log file contains:

ad => read tread at => ate crate crate's ate => crate crate's read => tread

This is interesting. http://wordlist.sourceforge.net/ SCOWL (Spell Checker Oriented Word Lists) has 652,000 words plus a range of smaller lists.


In reply to Re^2: Words in Words by Lotus1
in thread Words in Words by sarchasm

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