ErrorDocument 404 {{webroot}}/index.{{ext}}

RewriteEngine on

RewriteRule ^([a-z_]+)([0-9]*)\.html$ {{webroot}}/index.{{ext}}?p=$1&id=$2 [L]
RewriteRule ^([a-z_]+)([0-9]*)-([a-zA-Z0-9]+)\.html$ {{webroot}}/index.{{ext}}?p=$1&id=$2&sid=$3 [L]

RewriteRule (.*)/bookmarks$ {{webroot}}/bookmarks.{{ext}}?username=$1 [L]
RewriteRule (.*)/rss$ {{webroot}}/rss.{{ext}}?username=$1 [L]