preg_replace and the pipe character

[litebearer]

The code below will take a string and return only alphanumeric characters. I would like it to also keep the pipe character "|"; however, since the pipe is used by preg, I am uncertain how to achieve this. (I tried preceeding it with / and \ and + and whatever - yes I do experiment before asking).

 

Thanks for your help.

<?php
$string = "Here! is some text, and numbers 12345, and and pipe | and symbols !£$%^&";
$new_string = preg_replace('/[^a-zA-Z0-9]/', '', $string);
echo $new_string
?>

[.josh]

$new_string = preg_replace('/[^a-zA-Z0-9|]/', '', $string);

 

most things don't need to be escaped inside a char class. pretty much just the delim you use and whatever quote you use for the pattern string.

[litebearer]

Thank you very much!