PHP正则表达式 - 除了字母数字，空格，短划线和@符号之外的所有内容

I'm currently using this to remove unwanted characters:

    $pattern        = "[^a-zA-Z0-9_ .]*";
    $form_lookup    = @ereg_replace($pattern, '', $form_lookup);

How can I include/allow the @ sign?

These seem not to work as expected:

$pattern        = "[^a-zA-Z0-9_ .\@]*";
$pattern        = "[^a-zA-Z0-9_ .@]*";

Instead of ereg_replace use preg_replace:

$form_lookup    = 'foo@!:_;';
$pattern        = '/[^a-zA-Z0-9_ .@]*/';
$form_lookup    = preg_replace($pattern, '', $form_lookup);

Output:

string 'foo@_' (length=5)

You can use this regex:

/[^\w\s@-.]/

And use preg_* and not ereg_* asi it is deprecated