isSymbol is not catching some symbols

Question

i'm trying to use the isSymbol method to figure out if a user is using symbols in the chosen password. But when i parse the password and even though symbols such as # and $ are being used, the isSymbol does not catch it. It catches symbols + and =. I'm not sure what i'm doing. Is it something to do with pressing the shift key while entering the symbol? Help is appreciated. Thanks.