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From: Serhiy Storchaka <storchaka@gmail.com>
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Subject: Re: Detecting repeated subsequences of identical items
Date: Thu, 21 Apr 2016 14:56:07 +0300
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Xref: csiph.com comp.lang.python:107448

On 21.04.16 06:07, Steven D'Aprano wrote:
> Now I want to group subsequences. For example, I have:
>
> "ABCABCABCDEABCDEFABCABCABCB"
>
> and I want to group it into repeating subsequences.

[...]

> How can I do this? Does this problem have a standard name and/or solution?

This is a part of lossless data compression algorithms. See for example 
LZ, LZW.