PHP preg_replace regexp for dash

php, preg-replace

Solution

You have to escape `-` since it's a special character for regexes:

$link = preg_replace('/[^a-z0-9\-]/', '', strtolower($_POST['link_name']));

Problem

I am trying to replace anything in the string that is not a letter, number, or dash "-". How do I modify this line to include the dash? ``` $link = preg_replace('/[^a-z0-9]/', "", strtolower($_POST['link_name'])); ``` Do I just insert it in there? ``` $link = preg_replace('/[^a-z0-9-]/', "", strtolower($_POST['link_name'])); ```

Original source