Very simple question about using regex in PHP

[lucavilla]

Suppose that we have:

$one = "abc123lmn"

and we want to extract "123" out of it, with the simple regex [0-9], putting it in a variabile.

What's the PHP complete command to do this?

[effigy]

[code]
<?php
$one = 'abc123lmn';
preg_match('/\d+/', $one, $matches);
$num = $matches[0];
?>
[/code]