a simple string?

[deep]

Hi,

Just windering how to delete att the "special characters" from this string: "He!llo Wo%rld" so that the string only reads "HelloWorld", no spaces are allowed but _ is allowed.

A code example would be greatly appreciated!

Thanks!

[sidney]

<?php
$string="he!llo_w%orld";
$string = preg_replace("/[^{A-z0-9_]/","",$string);}
echo $string;
?>