I tried to compare binary strings which encode "equality tables", halves (triangles). I generate these strings through eval-group inside the regex:
#!/usr/bin/perl -l

use warnings;
use strict;

my $template = 'neocene';

my $equality_triangle_template = '';
$template =~ m/(.).*?(.)(?{ $equality_triangle_template .= $1 eq $2 ? 
+1 : 0 })(*FAIL)/;

my @dict;
@dict = <>; # <-- 354984si.ngl
chomp @dict;

my @good = grep {
    my $equality_triangle_word = '';
    m/(.).*?(.)(?{ $equality_triangle_word .= $1 eq $2 ? 1 : 0 })(*FAI
+L)/;
    $equality_triangle_word eq $equality_triangle_template;
    }
    grep length == length $template, 
    @dict;

print for @good;
^Z
kaitaka
lauhala
metreme
neocene
tempete

[download]
P.S.One can use (.).*(.) instead of (.).*?(.), omitting question mark - non-greediness modifier (possibly it is only slightly faster).

In reply to Re^6: Nonrepeating characters in an RE by rsFalse
in thread Nonrepeating characters in an RE by BernieC

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