Im trying to do a regular expression that only gets letters in a certain character set '^[abcd]+$ but i want to not get words like badd or cabb and only cab or bad so that each character in the character set is only used once or the number of time used in that character set? i dont know if this will be possible because i may have multiple occurences of the same character in one chracter set


Not to complicate this but that is only...