This is what I have:

PHP Code:

preg_match('/^http:\/\/:[www.]?arenlor.com\/index2.php$/i',$_SERVER['HTTP_REFERER']) 


I know referer can be faked or disabled but this isn't anything more than a fun feature on my one page actually so it's not needed. Anyway I think the issue is with the [www.]? part or it may be with the colon, not sure.

Check out this change:

PHP Code:

<?php
$_SERVER['HTTP_REFERER'] = 'http://www.arenlor.com/index2.php';
$_SERVER['HTTP_REFERER'] = 'http://arenlor.com/index2.php';
if (preg_match('/^http:\/\/(?:www.)?arenlor.com\/index2.php$/i',$_SERVER['HTTP_REFERER'])) {
  echo 'Referrer Match';
}
?>

There were 2 issues:
1) You had an extra colon in there.
2) Brackets are used to list allowed characters, not to denote a section (that's not the right word, but hopefully you get what I mean). Use parenthesis to denote a section. Adding ?: after the first parenthesis means that it doesn't capture the match -- it's optional for your usage here.

Hope that helps

Thanks, that solved it, not sure what the first two lines are though.

That's me sticking in test data. You wouldn't use it on a live site.

I never knew you could manipulate $_SERVER like that.

You can do that with any of the global variables.

That's pretty sweet.