.htaccess file showing 500 Internal Server Error - .htaccess

Question

I have this in my htaccess file:
RewriteCond %{HTTP_HOST} ^my\.domain\-uk\.net$ [OR]
RewriteCond %{HTTP_HOST} ^www\.my\.domain\-uk\.net$
RewriteRule ^/?$ "http\:\/\/www\.domain\-uk\.net\/my\-integra" [R=301,L]
RewriteCond %{HTTP_HOST} ^status\.domain\-uk\.net$ [OR]
RewriteCond %{HTTP_HOST} ^www\.status\.domain\-uk\.net$
RewriteRule ^/?$ "http\:\/\/www\.domain\-uk\.net\/service\-status" [R=301,L]
RewriteCond %{HTTP_HOST} ^dd\.domain\-uk\.net$ [OR]
RewriteCond %{HTTP_HOST} ^www\.dd\.domain\-uk\.net$
RewriteRule ^/?$ "https\:\/\/sub\.domain\.co\.uk\/preauth\/0J9A7MT35N" [R=301,L]
the status. redirects but the two after are showing 500 Internal Server Error
above this i have the standard Wordpress code:
# 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

Answer 1

The first rules that you want in your htaccess file are the ones the redirect the browser, the order is important, you don't want to redirect the browser after wordpress's internal rewriting. So first, you can clean up your redirect rules:
RewriteCond %{HTTP_HOST} ^(www\.)?my\.domain\-uk\.net$ [NC]
RewriteRule ^/?$ http://www.domain-uk.net/my-integra [R=301,L]
RewriteCond %{HTTP_HOST} ^(www\.)?status\.domain\-uk\.net$ [NC]
RewriteRule ^/?$ http://www.domain-uk.net/service-status [R=301,L]
RewriteCond %{HTTP_HOST} ^(www\.)?dd\.domain\-uk\.net$ [NC]
RewriteRule ^/?$ https://sub.domain.co.uk/preauth/0J9A7MT35N [R=301,L]
The ? makes the grouping optional, and the NC ignored the case. So after these rules, you can put your wordpress rules.