First, I must say I think I've seen what I want to achieve here in some other post but I don't know how to find it now - was posted several months ago.

An example would be:

String of: ABCDEFGHIJK

and, on one pass, I would like to capture the substrings (of some arbitrary length)

ABCDEF
BCDEFG
CDEFGH
DEFGHI
EFGHIJ
FGHIJK

Further, on every pass, I want to decrease the length of the strings to be captured by 1 until the outer while loop bails out.

Thanks for the note on my error concerning pos $str.

Hope this makes the problem clearer.

Chris

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