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#!/usr/bin/perl ... my $onelarger = s/([^\xff])\xff*\z/ $1 =~ tr||\x01-\xff|cr /er; dd 'out', $onelarger; }
("in", "aa") ("out", "ab") ... ("out", "b") ("in", "frequency/is/measured/in/hertz") ("out", "frequency/is/measured/in/hert{")