Sergey Biryukov

<?php
include 'wp-load.php';
$posts = get_posts('numberposts=-1');
foreach ( $posts as $post ) {
    preg_match('/([0-9]*)\. (.*)/', $post->post_title, $matches);
    if ( !empty($matches) ) {
        echo "Post #{$post->ID}<br />\n";

        echo "Number: {$matches[1]}<br />\n";
        add_post_meta($post->ID, 'number', $matches[1], true);

        echo "Title: {$matches[2]}<br />\n";
        $post->post_title = $matches[2];
        wp_update_post($post);
    }
}
echo 'All Done!';
?>