[MarkFL]

Create a plugin hooked at "newpost_process" with the following Plugin PHP Code:

PHP Code:

$title = strtolower($post['title']);

if (strpos($title, 'http://'))
{
    $post['message'] = '';
    $minchar = intval($vbulletin->options['postminchars']) <= 0 ? 1 : intval($vbulletin->options['postminchars']);
    require_once(DIR . '/includes/functions_misc.php');
    $errors[] = construct_phrase(fetch_phrase('tooshort', 'error'), $minchar);
} 


What this does is if "http://" is embedded in the thread title, the content of the post will be erased, and the user will be told their post is too short.

--------------- Added [DATE]1475698223[/DATE] at [TIME]1475698223[/TIME] ---------------

A more complete solution can be found here:

Block Censored Words in Posts by BOP5 VB4

This product will allow you to check post titles/content for additionally censored words/strings. You can specifiy which forums in which it is active too.