从字符串中删除非字母数字字符

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, az instead of aZ , 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.