String uit string

<?
if(ereg(' /^.*@(.*)@.*$/',$string,$match)){
echo $match[1];
?>

<?
if(ereg(' /^.*@(.*)@.*$/',$string,$match)){
echo $match[1];
?>

<?
if(ereg(' /^[A-Za-z0-9]+@([A-Za-z0-9]+)@[A-Za-z0-9]+$/',$string,$match)){
echo $match[1];
?>

<?
if(ereg(' /^[A-Za-z0-9]+@([A-Za-z0-9]+)@[A-Za-z0-9]+$/',$string,$match)){
echo $match[1];
?>

<?php
$string = 'niks@tekst@niks';
list(,$newString,) = explode('@', $string, 3);
echo $newString;
?>

<?php
$string = 'niks@tekst@niks';
list(,$newString,) = explode('@', $string, 3);
echo $newString;
?>

<?
$string = 'a@a@a';
$array = explode('@',$string);
echo $array[1];
?>

<?
$string = 'a@a@a';
$array = explode('@',$string);
echo $array[1];
?>