How do you block directory scans using htaccess?
From Joomla! Documentation
Directions[edit]
Add Apache rewrite rules to your .htaccess file. For example, the following will redirect all attempts to access files with names starting with, phpMyAdmin to index.php:
RewriteRule ^/phpMyAdmin.*$ /index.php
Some Regular Expression Tips[edit]
^ Means start of filename . Means any character other than newlines * Means one or more of the previous character $ Means end of line