Try this. I project that it should complete your 410 billion comparisons in a little under 10 hours.
The main attempt at efficiency here is to invoke the regex once in global mode (/g) for each word, against a single large string containing all the words and have it return all the matches. It then filters just the matching ones for your specific exclusions.
#! perl -slw
use strict;
my @words = do{ local @ARGV = 'words.txt'; <> };
chomp @words;
my $all = join ' ', @words;
my $start = time;
my $n = 0;
for my $i ( @words ) {
for my $j ( $all =~ m[ ([^ ]*$i[^ ]*) ]g ) {
next
if $j eq $i
or $j eq "${i}s"
or $j eq "${i}'s";
# print "$j contains $i";
}
}
printf STDERR "Took %d seconds for %d words\n",
time() - $start, scalar @words;
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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