I want to be able to verify that a string contains only ascii characters, not ISO-8859-1, or UTF-8, or anything else. Is a regex like this sufficient? 
    $str !~ /[\x80-\xff]/;

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I know that is good enough to eliminate ISO-8859-1 but I'm not sure of other encodings. Should I be using some module's function? If so, which one?

In reply to testing if a string is ascii by Anonymous Monk

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