Quick little help with preg_match

I've stated this a few times but I really suck with preg_match's I can't seem to learn them for some reason. Anyways, below is a simple php function to check to see if a backlink exists on another site and it will also check to see if there is a nofollow tag. The script works fine with the backlink is something like thsi

http://www.domain.com

but if the backlink on the other site is like this

http://www.domain/com/page1.php

The script will say no link exists. How can I edit the code to check to see if just

http://www.domain.com

exists on the site and then dismiss anything that may come after the that?

function check_back_link($remote_url, $your_link) {
    $match_pattern = preg_quote(rtrim($your_link, "/"), "/");
    $found = false;
    if ($handle = @fopen($remote_url, "r")) {
        while (!feof($handle)) {
            $part = fread($handle, 1024);
            if (preg_match("/<a(.*)href=[\"']".$match_pattern."(\/?)[\"'](.*)>(.*)<\/a>/", $part, $match)) {
                if (preg_match("/rel=[\"']?nofollow[\"']?/", $match[0]))
                    $found = false;
                else
                    $found = true;
                break;
            }
        }
        fclose($handle);
    }
    return $found;
}

PHP:

Sorry it that's a little confusing I tried to explain it the best I could.

Thansk