Check if a string contains only given characters

Question

I\'m wondering if there is more elegant way to check if the string (str = \'abcccbbaabcbca\') contains only \'a\',\'b\' or \'c\' than iterating over it :

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Answer 1

Feel free to mock, since this jumps directly to a regular expression, but test for matching against "^[abc]+$"

re.match('^[abc]+$', 'string')