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sub matchrule {
  my ( $old, $highs, $word ) = @_;
...
  $tiles =~ s/$_// or return 0 for ( $newmask & $word ) =~ /\w/g;
  return 1;
}

'hello' ^ 'world' => "\37\n\36\0\13"

my $newmask = ('hello' ^ 'world') =~ tr/\0/\xff/cr => "\377\377\377\0\
+377"

("\377\377\377\0\377" & '14222') => "142\0002"

"\377\377\377\0\377" & 'world' => "wor\0d"