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  1. or download this
    $text =~ s/\$(\w+)/$$1 * 2/egx;  #I tried to double the age and succee
+ded!
  2. or download this
    $AGE = 17;
$tmpl = 'I am %s years old';      # note single quotes
$text = sprintf $tmpl, $AGE * 2;  # print I am 17 years old