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So, fwiw, I had to do the following to your code to get your method to work the way I wanted and cover all corner cases I've tested. (If the change spans to the very last character for example, then your first condition fails and you never assign $+[0] to $lsubscr ... So I had to do the following.
This was to fix if the difference was the very last string char and one character is missing from another. Like in the case of data like:
In this case the difference is -1, but because I had to add one to it, it was set to 0. But 0 is the beginning of the string, not the character just past the end of the string. In reply to Re^2: string diff and compare
by raybies
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