<?php
$data = file('testBFHTI.html');
$nbNames=0;
$pattern='/(\w)\w*\.(\w{4})\w*\@bfh\.ch/i';

$replace='$2${1}1@bfh.ch';


foreach($data as $i=>$line){

  $line2 = preg_replace($pattern,$replace,$line);
  echo $line2;  
}


?>