How to use preg_match with file extension in PHP 5.6

Question

I'm looking for a file which name is like this string: .047b2edb.ico

I am not sure how to add "ico" extension to my preg_match function.

[.a-zA-Z0-9]

Any suggestions would be appreciated

This is my whole code. With this code I can't find a file with name .62045303.ico where is the problem ?

<?php
$filepath = recursiveScan('/public_html/');

function recursiveScan($dir) {
    $tree = glob(rtrim($dir, '/') . '/*');
    if (is_array($tree)) {
        foreach($tree as $file) {
            if (is_dir($file)) {
                //echo $file . '<br/>';
                recursiveScan($file);
            } elseif (is_file($file)) {
               if (preg_match_all("(/[.a-zA-Z0-9]+\.ico/)", $file )) {
                   //echo $file . '<br/>';
                   unlink($file);
               }

            }
        }
    }
}
?>

Answer 1

[.a-zA-Z0-9]+\.ico

will do it.

Explanation:

[.a-zA-Z0-9]  match a character which is a dot, a-z, A-Z or 0-9
+             match one or more of these characters
\.ico         match literally dot followed by "ico".
              the backslash is needed to escape the dot as it is a metacharacter

Example:

$string = 'the filenames are .asdf.ico and fdsa.ico';

preg_match_all('/[.a-zA-Z0-9]+\.ico/', $string, $matches);

print_r($matches);

Output:

Array
(
    [0] => Array
        (
            [0] => .asdf.ico
            [1] => fdsa.ico
        )

)