https://www.php.net/manual/uk/function.ctype-alnum.php
PHP: ctype_alnum - Manual
Check for alphanumeric character(s)
phpctypealnummanual
https://www.boost.org/doc/libs/1_52_0/doc/html/boost/xpressive/alnum.html
Global alnum
globalalnum
https://alnumkids.my.id/
Alnum Kids
alnumkids
https://www.boost.org/doc/libs/1_53_0/doc/html/boost/algorithm/is_alnum.html
Function is_alnum
functionalnum