Options All -Indexes

RewriteEngine On 
RewriteRule ^([-a-zA-Z0-9/]+)$ index.php?pagina=$1 

# asegurando el archivo htaccess

<Files .htaccess>
order allow,deny
deny from all
</Files>

# denegar acceso a robots maliciosos, extractores de webs y navegadores offline
# RewriteBase /
RewriteCond %{HTTP_USER_AGENT} ^Anarchie [OR]
RewriteCond %{HTTP_USER_AGENT} ^ASPSeek [OR]
RewriteCond %{HTTP_USER_AGENT} ^attach [OR]
RewriteCond %{HTTP_USER_AGENT} ^autoemailspider [OR]
RewriteCond %{HTTP_USER_AGENT} ^Xaldon\ WebSpider [OR]
RewriteCond %{HTTP_USER_AGENT} ^Xenu [OR]
RewriteCond %{HTTP_USER_AGENT} ^Zeus.*Webster [OR]
RewriteCond %{HTTP_USER_AGENT} ^Zeus
RewriteRule ^.* - [F,L]
