Marcus, try

*function ValidStr
lparameters str2check
local validchars,testchars
validchars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 "
testchars = space(len(validchars))
return len(alltrim(chrtran(str2check,validchars,testchars))) = 0

Using validchars as above ValidStr("Silvio") will return .F. while ValidStr(upper("Silvio")) will return .T:

Just adjust validchars to your needs

HTH

Silvio

>I need to check names and addresses for invalid characters. What do you guys think is the best command/function to use for this. Thanks for your help.
>Marcus.