Why not just remove the <A> tag from $_CONF['user_html'] in config.php?
Why not use the SNL-module for Spam-X to sort out posts with your pre-set allowed number of links?
You can also use regular expressions (regex) in your blacklist.
Check your config.php
// disables autolinks if set to 1
$_CONF['disable_autolinks'] = 0; // 0 = autolinks enabled
// disables autolinks if set to 1
$_CONF['disable_autolinks'] = 0; // 0 = autolinks enabled