Mistakes in htaccess redirects? - .htaccess

Question

I am a beginner with htaccess stuff and need help checking for mistakes in my htaccess codes below ?
I have 3 set of redirect codes and wondering if they interfere with each other ?
Also wondering if I have redundant redirect code.
Also specifically within the "Stop Hotlinking Code", is this RewriteCond correct?
RewriteCond %{HTTP_REFERER} !^http://(www\.)%{HTTP_HOST}/.*$ [NC]
My goal is to KEEP the www and trailing slash for my URLs , and to remove the index.html for my URLs
Here is my .htaccess File
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
#Force Trailing Slash
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !(.*)/$
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1/ [L,R=301]
#Redirect non-www to www
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1/ [R=301,L]
#Redirect index.html
RewriteCond %{THE_REQUEST} ^.*/index.html [NC]
RewriteRule ^(.*)index.html$ http://www.%{HTTP_HOST}/$1/ [R=301,L]
#Stop Hotlinking
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)%{HTTP_HOST}/.*$ [NC]
RewriteRule \.(gif|jpg|jpeg|bmp|zip|rar|mp3|flv|swf|xml|php|png|css|pdf)$ - [F]
.
Edit:
Questions:
-Is my updated htaccess below correct?
-Do I put RewriteBase / at the top or keep it as is (one with the # Begin WordPress rules and a second RewriteBase / with # Force Trailing Slash ?
-Do I need Options +FollowSymLinks and if yes where do I put this?
Notice that I:
-removed the RewriteEngine On and RewriteBase / from WordPress rules and kept it at the top
-put WordPress Rules BELOW redirects
-removed end slashes for #Redirect non-www to www and #Redirect index.html
RewriteEngine On
# Redirect non-www to www
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
# Redirect index.html
RewriteCond %{THE_REQUEST} ^.*/index.html [NC]
RewriteRule ^(.*)index.html$ http://www.domain.com/$1 [R=301,L]
# Force Trailing Slash
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !(.*)/$
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1/ [L,R=301]
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
# Stop Hotlinking
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)domain.com/.*$ [NC]
RewriteRule \.(gif|jpg|jpeg|bmp|zip|rar|mp3|flv|swf|xml|php|png|css|pdf)$ - [F]

Answer 1

No it's not correct. You can't have % variables or back references in the regex part of the condition. You could use a regex backreference though. Try:
RewriteCond %{HTTP_HOST}:::%{HTTP_REFERER} !^([^:]+):::http://(www\.)\1/.*$ [NC]