Szathmáry László honlapja @ DEIK | Nim2 / Character classes

Sometimes you need to work with the English alphabet, with digits, etc. Here I collect these character classes for reference.

$ python3
Python 3.14.7 (main, Aug 10 2026, 07:46:56) [GCC 16.1.1 20260728] on linux
>>> import string
>>>
>>> string.ascii_letters
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
>>>
>>> string.ascii_lowercase
'abcdefghijklmnopqrstuvwxyz'
>>>
>>> string.ascii_uppercase
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
>>>
>>> string.printable
'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~ \t\n\r\x0b\x0c'
>>>
>>> string.whitespace
' \t\n\r\x0b\x0c'
>>>
>>> string.digits
'0123456789'
>>>
>>> string.octdigits
'01234567'
>>>
>>> string.hexdigits
'0123456789abcdefABCDEF'
>>>
>>> string.punctuation
'!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'

But don't forget: in Nim, you can create sets easily:

let
lowercase = {'a'..'z'}
alphabet = {'a'..'z', 'A'..'Z'}

See here for more info about sets.