"jeffrey" =~ /(.*?)(.)\2(.*)/;
print "$1 + $2 + $2 + $3 = $1$2$2$3\n";

{
  local ($1,$2,$3);
  print "$1 + $2 + $2 + $3 = $1$2$2$3\n";
  "" =~ /(?=)/;
  print "$1 + $2 + $2 + $3 = $1$2$2$3\n";
}