[Python] How to separate the string by specific symbols and write it to list in Python?

I have the following string:

my_string='11AB2AB33'

I'd like to write this string in a list, so 'AB' is a single element of this list in the following way:

['1', '1', 'AB', '2', 'AB', '3', '3']


I tried to do it by

list(my_string)


but the result wasn't what I expected:

['1', '1', 'A', 'B', '2', 'A', 'B', '3', '3']


I also tried partition method:

list(my_string.partition('AB'))


and also didn't get expected result

['11', 'AB', '2AB33']

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