What happened to my regex?

Question

I need to remove any character that is not from 0 to 9, from a to z, but from A to Z.

heres my code:

$alt = preg_replace('/[^0-9a-fA-F]/', '', $_POST['alt-text']);

right now if i type “alt text” it will turn it into “ae”

Answer 1

You have af instead of az, the same for AZ.