mod_rewrite rule for "www to non www" doesn't redirect sub-pages - apache

Question

I have made a thorough search before I have asked this question here. Please hear me out:
I am trying to redirect my blog from www to non www and it doesn't redirect any sub-pages. I have an http > https redirect in place as well and it works perfectly for both domain as well as the sub-pages. Here are the rules I have in my .htaccess
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteRule ^^rcp-pep-ipn //?rcp-pep-listener=IPN [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
RewriteBase /
RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} ^www\. [NC]
RewriteCond %{HTTP_HOST} ^(?:www\.)?(.+)$ [NC]
RewriteRule ^ https://%1%{REQUEST_URI} [L,NE,R=301]
</IfModule>
# END WordPress
I'd really appreciate an explanation if I am doing anything wrong here. I have literally pulled my hair since I have used the exact same code (from the second RewriteBase /) for all other sites and it worked flawlessly.

Answer 1

You should bring those protocol checking conditions to the beginning. You have some problems within the rules too. Try:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} ^www\.(.*) [NC]
RewriteRule ^(.*)$ https://%1/$1 [R=301,NE,L]
RewriteRule ^rcp-pep-ipn /?rcp-pep-listener=IPN [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>