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How about using the tr operator to count non-printables. something like
if tr/a-zA-Z0-9!@#$%^&*()_+-={}[]|\\,./<>?:";'//cs > 0 { # Has non-printables.... }
Note: Concept tested, and works, - exact tr statement not tested.

Offense, like beauty, is in the eye of the beholder, and a fantasy.
By guaranteeing freedom of expression, the First Amendment also guarntees offense.

In reply to Re: Sniffing binary data, heuristics? by NetWallah
in thread Sniffing binary data, heuristics? by Ryszard

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