Result = IsLetter ( sArg AS String ) AS Boolean Result = Letter? ( sArg AS String ) AS Boolean
Returns TRUE if the string sArg contains only letters.
A letter is one of the following characters: [ ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz ]
PRINT IsLetter("Gambas") <hr>True
PRINT IsLetter("Cool!") <hr>False