Just wondering if there's a single function that will tell me whether a string contains only a specific characater. For example, if I have strings that are number codes of different lengths (e.g., "22313", "4525234", "33232") how can I flag ones that only contain "3"s in them (so yes to "3", "33", "333" and so on but no to "313", "3333313", "3338")?
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