It appears to me that each of your triple (X # Y) is a piece of a route with X being the starting point and Y being the end point.

What you seem to have in $array is a long route and a shorter one in $delim.

No you seem to want to find regions in $array that give you the same stop on the long route, you got on the short.

So here is my idea:

  1. Make two HoA where you store for each starting and each end point a list of indeces in your $array where to find them
    example data structure: 
    %start = (
  A => [ 0, 1, ],
  B => [ 4, 6, ],
  C => [ 2, 5, ],
  D => [ 3, ],
}
%end = {
  A => [ 0, ],
  B => [ 3, 5, ],
  C => [ 1, 4, ],
  D => [ 2, ],
  E => [ 6, ],
);

    [download]
  2. With this information you can easily find, for each starting point, where it is located.
  3. You will also find easily where each end point can be found.
  4. A valid route from A to C are now all those ranges where the value from @{$start{'A'}} is less or equal to a value from @{$end{'C'}}
    This should be:
    A C
    0 1
    0 4
    1 1
    1 4
  5. Implementation is left as an excercise to you ;-)

s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e

In reply to Re: Identifying Delimited Regions of an Array by Skeeve
in thread Identifying Delimited Regions of an Array by neversaint

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