Maybe this will help. I took the approach that it doesn't matter what the "cypher pattern" is as long as it's the same for both, but I'm probably missing something.
sub e{$a=$_;eval"\$a=~y/\Q$_\E/\0-~/";$a}

sub c{
  ($_,$m,$n,$a,$d)=@_;

  map{$x=e;

      $_,[grep{e eq$x}@$d]

     }/\b[^ ]{$m,$n}\b/g
}

[download]
107 chars w/o the linebreaks and indentation.
update: changed \S to [^ ] (as per chipmunk) to match tabs and newlines in encoded strings: 109 chars.
(but note that using $_[0..4] would get back a couple of chars.)
Actually, the really correct way to do it seems to be something along the lines of:
map{$x=e;$_,[grep{e eq$x}@{$_[4]}]}

" $_[0] "=~/ ([^ ]{$_[1],$_[2]})(?= )/g

[download]
which makes it 115 chars.

update2: Same length but more straightforward:
map{$x=e;$_,[grep{e eq$x}@{$_[4]}]}

grep{/^.{$_[2],$_[3]}$/s}$_[0]=~/[^ ]+/g

[download]
Well it would be the same length:  `grep/.../,' parses, but    `grep/.../s,' doesn't seem to.
Oh, and this last has the args ordered right. As to how I got it "working with the parameter errors"; simple, I was calling it with the args in the wrong order.

  p

In reply to Re: (Golf) Cryptographer's Tool #2 by petral
in thread (Golf) Cryptographer's Tool #2 by Masem

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