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

je + f + f + rey = jeffrey
je + f + f + rey = jeffrey
 +  +  +  =