[Python] Matching blocks of text

I have some text that looks like so,

PIN ABC
DIRECTION IN;
PORT
RECT 10 20 20 40;
END
END ABC

PIN ABC2
DIRECTION OUT;
PORT
RECT 10 20 20 40;
END
END ABC2


I need to extract the block of PIN definition that lives between PIN xxx and END xxx. I am trying to parse the text file with regex and I am not getting the desired result since I have nested END statement.

with open(f,'r') as fh:
all = fh.read()
re.search('PIN(.*)END', all, re.DOTALL)


I really need to search for PIN xxx and END xxx as block markers

Is there a way

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