mydomain.com/forum/ is a real directory.
When I do add these 2 lines to my .htaccess:
RewriteRule ^forum/([a-zA-Z0-9_-]+)/new-thread /forum/new-thread.php?comm=$1 [L] RewriteRule ^forum/([a-zA-Z0-9_-]+) /forum/community.php?comm=$1 [L]
mydomain.com/forum/index.php throws a 500 error, as well as all rules that are supposed to be changed by these lines. What am I doing wrong?