it can work on win98,but can't on linux?

[Anon]

"doom.txt"
123CHINA
JAYCHINASER
JAYBHARATMARUTI
DCOCHINAING
JAYJALARAM
JCHINAMZ

"test.php"
<?php
$filename="doom.txt";
$contents=file($filename);
$reg_str="/^{[a-zA-Z0-9]{0,26}(?i)(china)[a-zA-Z0-9]{0,9}$/";}
$domain_array=preg_grep($reg_str,$contents);
$domain_num=count($domain_array);
echo $domain_array[1]." ".$domain_array[2]." ".$domain_num;
?>

it can work well on win98+php4
but it can't work on linux+apache+php
why??please help me

[Anon]

What isn't working?
What does it output on linux?
What does it output on windoze?