PHP preg_replace regexp for dash

Question

I am trying to replace something in a string that is not a letter, number or dash "-".

How to change this line to include a dash?

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

Am I just pasting it there?

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

+4

Jrob Jun 04 '12 at 13:09

2 answers

Just add - to the end of the class ( [^a-z0-9-] ).

- does not matter much at the end of the class. Alternatively, avoid it with a backslash.

+6

Niet the dark absol Jun 04 '12 at 13:10

Wirone · Accepted Answer · 2012-06-04T13:12:36+0000

You need to exit - as it is a special character for regular expressions:

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