i need help

[chinawhite]

I have a problem on my forum. When i open a new thread , it always gives this warning:

Parse error: syntax error, unexpected T_BAD_CHARACTER, expecting T_STRING or T_VARIABLE or T_NUM_STRING in /home/.../public_html/forum/includes/class_postbit.php(296) : eval()'d code(43) : regexp code on line 8

Fatal error: preg_replace() [<a href='function.preg-replace'>function.preg-replace</a>]: Failed evaluating code: &quot;&lt;pre class=\&quot;alt2\&quot; dir=\&quot;ltr\&quot; style=\&quot; margin: 0px; padding: 6px; border: 1px inset; width: 640px; height: 34px; text-align: left; overflow: auto\&quot;&gt;$context[\'num_users_online\'] = count($context[\'users_online\']) + $context[\'num_users_hidden\'];&lt;/pre&gt;&quot;==&quot;&lt;pre class=\&quot;alt2\&quot; dir=\&quot;ltr\&quot; style=\&quot; margin: 0px; padding: 6px; border: 1px inset; width: 640px; height: 34px; text-align: left; overflow: auto\&quot;&gt;$context[\'num_users_online\'] = count($context[\'users_online\']) + $context[\'num_users_hidden\'];&lt;/pre&gt;&quot;? &quot;&lt;pre class=\&quot;alt2\&quot; dir=\&quot;ltr\&quot; style=\&quot; margin: 0px; padding: 6px; border: 1px inset; width: 640px; height: 34px; text-align: left; overflow: auto\&quot;&gt;$context[\'num_users_online\'] = count($cont in /home/.../public_html/forum/includes/class_postbit.php(296) : eval()'d code on line 43

what can it be solution for my problem ?