www-lib-markdown/php/test.php

<?php
include 'markdown.php';
include 'spreadsheet.php';

$address = 'C6';
if (mb_eregi('^(\\$?)([A-Z]{1,2}?)((?:\\$(?=[0-9]))?)([0-9]*)$', $address, $groups)) {
    print("Matched\n");
    print_r($groups);
} else {
    print("No match!\n");
}

?>