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#! /usr/bin/perl -ni BEGIN { ... if s/HAI WORLD Times ([0-9]+).*/ "\t\t<exML LOLZ = \"" . unpack(\'a1\', $1) . "\" />" /eg;
$replaceString = sub { "\t\t<exML LOLZ = \"" . unpack(\'a1\', $1) . "\" />" ... # time passes $array[$elementIdx++] = $replaceString->();