https://dyn.manpages.debian.org/testing/manpages-de-dev/isalnum.3.de.html
isalnum(3) — manpages-de-dev — Debian testing — Debian Manpages
isalnummanpagesdevdebiantesting
https://man.openbsd.org/OpenBSD-7.5/isalnum.3
isalnum(3) - OpenBSD manual pages
manual pagesisalnumopenbsd
https://www.tpointtech.com/python-string-isalnum-method
Python String isalnum() Method - Tpoint Tech
Python isalnum() method checks whether the all characters of the string is alphanumeric or not.
pythonstringisalnummethodtpoint