Test if string ONLY contains given characters

Question

What\'s the easiest way to check if a string only contains certain specified characters in Python? (Without using RegEx or anything, of course)

Specifically, I have

Answer 1

I will assume your reluctance for regexp is not really an issue :

strings = ['aba', 'acba', 'caz']
given = "abc"
filter(lambda value: re.match("^[" + given + "]$", value), strings)