simple question about preg_match() in php
<p>i used bellow code to search and find if http is includes in $url address user enters </p>

<pre><code>if (!preg_match("/http:///", $user_website) 
</code></pre>

<p>but i got this error </p>

<pre><code>Warning: preg_match() [function.preg-match]: Unknown modifier '/' in
</code></pre>

<p>i know its becuase of // of http  but how work arround this !?</p>
