Php preg_match issue
<p>With following php preg_match i'm trying to show a error message if someone input any value except a-z or  0-9 in a textarea form. Just only user can type string and numerice value. Not , &lt; ? >any php, javascript tag etc.</p>

<pre><code>if(preg_match("/^[a-zA-Z0-9]+/ ", $wall) != 1)
$err[] = "Wrong value";
</code></pre>

<p>So, if  i put <strong>php tag</strong> to the begning of the form then it's show error message but if i put "Some text then type <strong>php tag</strong> and  another value" then it's doesn't show any error message.</p>

<p>Sorry my bad english.:(</p>
