I would like to check a string for allowed characters used. According to te manual I can use the function charsIn for that.
During testing I discovered that charsIn('A') works fine, but charsIn('A'..'Z') does not. When I use a range Corticon gives me a null pointer exception.
Am I using this function properly?
It does not appear this operator supports a range. It only supports a string containing the set of all valid characters.
In your case, it would be 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.