----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, June 02, 2000 11:27 AM Subject: [REBOL] Screening chars from strings > Hi: > I want to write a function that tests a string > for an exclusive set of characters: > ex: > found-unwanted: func [str[string!] allowed[string!]] > [ > ;test <str> to make sure that only characters in > ; <allowed> are present, return true if not all > ; characters in <str> match characters in <allowed> > ] > > found-unwanted "abd" "abc" > == true > ; the first parameters contains a 'd' which is not allowable, > ; because it is not found in the second parameter > Given what I know now, I can do this in about 5 lines of rebol code. > I bet someone out there can do it in 1!! > Thanks folks! > Tim > Hi Tim, Rather than give you a direct answer I'll just point you at a few built in functions which are good for dealing with sets. (note some of them are in view but will be in the next core release). Many of these can provide a one line solution for your problem, (by testing the length of the resultant string). difference union unique exclude And one that isn't always so obvious (beware though trim is case sensitive, at least in the latest view version) trim/with Cheers, Allen K
