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#!/usr/bin/perl -w use strict; open WORDS, "/usr/dict/words" or die "no more words: $!"; for (@ARGV) { my @avoid = do { my @lits = /[a-z]/g; @lits ? "[" . join("", @lits) . "]" : () }; my %template; my $regex = "^"; for (split //) { if (/[a-z]/) { $regex .= "$_"; } elsif (/[A-Z]/) { if (exists $template{$_}) { $regex .= $template{$_}; } else { my $id = 1 + keys %template; if (@avoid) { $regex .= "(?!" . join("|", @avoid) . ")"; } $regex .= "(.)"; push @avoid, $template{$_} = "\\$id"; } } else { warn "ignoring $_"; } } $regex .= "\$"; print "$_ => $regex\n"; seek WORDS, 0, 0; while (<WORDS>) { next unless /$regex/i; print; } }

In reply to pat - find words by matching pattern (for crypto) by merlyn

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