Regex to identify a Medical Beneficiary Identifier(MBI) in python

So I am trying to create a regex for MBIs (medical beneficiary identifiers) in python and my regexes wont work.

Any example of a MBi is: 1EG4-TE5-MK73

Here is the format to MBIs:

• 11-Characters

• The MBI’s 2nd, 5th, 8th, and 9th characters will always be a letter.

• Characters 1, 4, 7, 10, and 11 will always be a number.

I have tried using the following regex but to no avail:

mbi=re.compile(r"[1-9]{1}[^SLOIBZsloibz|^0-9]{1}[^SLOIBZsloibz]{1}[0-9]{1}-?[^SLOIBZsloibz|^0-9]{1}[^SLOIBZsloibz]{1}[0-9]{1}-?[^SLOIBZsloibz|^0-9]{1}[^SLOIBZsloibz|^0-9]{1}[0-9]{1}[0-9]{1}")

Any suggestions?!?!

Here is the format to MBIs:

1. 11-Characters
2. The MBI’s 2nd, 5th, 8th, and 9th characters will always be a letter.
3. Characters 1, 4, 7, 10, and 11 will always be a number.

There's no mention about the 3rd and 6th characters, but based on your example, you can use a regex like:

\b\d[A-Z]{2}\d-[A-Z]{2}\d-[A-Z]{2}\d{2}\b

Regex Demo

Regex Explanation: