CodeWars || Not very secure || JavaScript || Code Challenge

Описание

In this example you have to validate if a user input string is alphanumeric. The given string is not nil/null/NULL/None, so you don't have to check that.

The string has the following conditions to be alphanumeric:

At least one character ("" is not valid)
Allowed characters are uppercase / lowercase latin letters and digits from 0 to 9
No whitespaces / underscore