How to read the next 4 characters from the last occasion of a string from a textfile?

@boneheadfraggle wrote:

I have a Zipato/Schlage Mini Keypad and I’m trying to get a hold of which user code was used for the arm/disarm.
I have found the string in the OZW_Log.txt that indicates the user code slot, so now I just need to find the string to make a sensor or attribute out of it.

At a certain state change, I want to search the OZW_Log.txt for "Received: 0x01, 0x10, 0x00, 0x04, 0x00, 0x06, 0x0a, 0x71, 0x05, 0x00, 0x00, 0x00, 0xff, 0x06, 0x06, 0x01, ", then grab the following 4 characters and put that in a sensor.

Any suggestions how to accomplish that?

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