RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9} /.*.html HTTP/
RewriteRule ^(.*).html$ $1 [R=301,L]

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /

    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_URI} ^.*..*$
    RewriteRule ^(.*)..*$ $1 [R,L]

    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_URI} ^(.*)/$
    RewriteRule ^(.*)/$ $1 [R,L]

    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_URI} !^/pages/
    RewriteRule ^(.*)$ pages/$1.html [L]
</IfModule>