Removing non-alphanumeric characters from a string

Question

I have a string in PHP and I want it to match the regex [A-Za-Z0-9]. How can I do this?

Answer 1

I am assuming you meant, a-z instead of a-Z, inside of your regex, but you can use preg_replace

$new_string = preg_replace("/[^a-zA-Z0-9\s]/", "", $string);

It takes as arguments the pattern ([a-zA-Z0-9]), replacement ("") and the subject ($string) and returns the new string ($new_string)

Answer 2

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

Answer 3

\W is a shortcut for [a-Z0-9_]. May not be extremely helpful as it allows underscores too, but thought I'd let you know.