How fast is a naive solution for you?
#!/usr/bin/perl -w
use strict;
open WORDS, "/usr/share/dict/words" or die;
my @words = <WORDS>;
chop @words;
close WORDS;
printf "Loaded %d words.\n", scalar @words;
# Favor long words
@words = sort { length $b <=> length $a } @words;
my $re = join '|', map quotemeta, @words;
while (<>)
{
study; # ??
1 while s/$re/[*]/io;
print;
}
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