PHP regular expression
===

I have a little problem with a reqular expression in my application. I have following code which works well for all patterns, that are not just '/':

    if (preg_match("#". $pattern1 . "(/.*+)?#", $pattern2)) {
        $topActive = TRUE;
    }

When I have `$pattern1` with /line-up or /line-up/opening and `$pattern2` with /line-up/opening it works as expected. But it also matches when I have just '/' as `$pattern1`. what can I do to prevent matching against '/', but let it still match against the other mentioned patterns?