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  # use \Q and \E
  $process = qr/\s+(?:\d+[:])+?\d+\s+.*?\Q$ARGV[0]\E.*?\s*$/;
  # or enclose in an eval
  eval { $process = qr/\s+(?:\d+[:])+?\d+\s+.*?$ARGV[0].*?\s*$/; };
  if($@) { ... }