List out of range error

[mystardious]

Hey Andy,

Problem:

I found a small bug when testing the code you provided:

I've located the problem to be with the lambda function you use to extract special characters, more specifically with:

extract_special_chars = lambda string: ([char for char in re.findall(r"[^\w]", string)], ...

Example input:

fpe_encrypt_or_decrypt('WD_DistServiceCapital', 'ENCRYPT')

Solution

Code throws an error when using underscores because it is part of \w character set.

I suggest changing it the following:

re.findall(r"[^a-zA-Z0-9]", string)