FIND:

 NOTE --- Removing trailing whitespaces

	$username = phpbb_clean_username($username);
	
	$sql = "SELECT username 
		FROM " . USERS_TABLE . " 

REPLACE WITH:

	$username = phpbb_clean_username($username);

	$sql = "SELECT username 
		FROM " . USERS_TABLE . "

FIND:

		if ($row = $db->sql_fetchrow($result))

REPLACE WITH:

		while ($row = $db->sql_fetchrow($result))

FIND:

				if (preg_match("#\b(" . str_replace("\*", ".*?", phpbb_preg_quote($row['disallow_username'], '#')) . ")\b#i", $username))

REPLACE WITH:

				if (preg_match("#\b(" . str_replace("\*", ".*?", preg_quote($row['disallow_username'], '#')) . ")\b#i", $username))

FIND:

				if (preg_match("#\b(" . str_replace("\*", ".*?", phpbb_preg_quote($row['word'], '#')) . ")\b#i", $username))

REPLACE WITH:

				if (preg_match("#\b(" . str_replace("\*", ".*?", preg_quote($row['word'], '#')) . ")\b#i", $username))