Nginx and/or htaccess - .htaccess

Question

By default (I'm using Xenforo for a forum), the URLs behave as:
https://< domain >/forums/< forumName >.< forumID >/
and
https://< domain >/threads/< threadName >.< threadID >/
What I'm attempting to do:
https://< domain >/< forumName >.f< forumID >/
and
https://< domain >/< threadName >.t< threadID >/
tl;dr: removes "forum" or "threads" from the URL & drops in a "f" or "t" prefix to the ID
Here's what I've been attempting (and failing) to put into place:
nginx.conf
rewrite ^/[^\./]+\.f([0-9]+)/$ /forums/$1/ permanent;
rewrite ^/[^\./]+\.t([0-9]+)/(.*)$ /threads/$1/$2 permanent;
.htaccess
RewriteRule ^[^\./]+\.f([0-9]+)/ /forums/$1/ [R=301,L]
RewriteRule ^[^\./]+\.t([0-9]+)/ /threads/$1/ [R=301,L]
full nginx.conf:
user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;
events {
worker_connections 768;
# multi_accept on;
}
http {
##
# Basic Settings
##
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;
# server_names_hash_bucket_size 64;
# server_name_in_redirect off;
include /etc/nginx/mime.types;
default_type application/octet-stream;
##
# SSL Settings
##
ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;
##
# Logging Settings
##
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
##
# Gzip Settings
##
gzip on;
gzip_disable "msie6";
# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
##
# Virtual Host Configs
##
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}
location / {
rewrite ^/[^\./]+\.f([0-9]+)/$ /forums/$1/ permanent;
rewrite ^/[^\./]+\.t([0-9]+)/(.*)$ /threads/$1/$2 permanent;
}
#mail {
# # See sample authentication script at:
# # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
# # auth_http localhost/auth.php;
# # pop3_capabilities "TOP" "USER";
# # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
# server {
# listen localhost:110;
# protocol pop3;
# proxy on;
# }
#
# server {
# listen localhost:143;
# protocol imap;
# proxy on;
# }
#}
full .htaccess:
Code:
# Mod_security can interfere with uploading of content such as attachments. If you
# cannot attach files, remove the "#" from the lines below.
#<IfModule mod_security.c>
# SecFilterEngine Off
# SecFilterScanPOST Off
#</IfModule>
ErrorDocument 401 default
ErrorDocument 403 default
ErrorDocument 404 default
ErrorDocument 405 default
ErrorDocument 406 default
ErrorDocument 500 default
ErrorDocument 501 default
ErrorDocument 503 default
<IfModule mod_rewrite.c>
RewriteEngine On
# If you are having problems with the rewrite rules, remove the "#" from the
# line that begins "RewriteBase" below. You will also have to change the path
# of the rewrite to reflect the path to your XenForo installation.
#RewriteBase /xenforo
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.*$ - [NC,L]
RewriteRule ^(data/|js/|styles/|install/|favicon\.ico|crossdomain\.xml|robots\.txt) - [NC,L]
RewriteRule ^.*$ index.php [NC,L]
RewriteRule ^/[^\./]+\.f([0-9]+)/$ /forums/$1/ [R=301,L]
RewriteRule ^/[^\./]+\.t([0-9]+)/(.*)$ /threads/$1/$2 [R=301,L]
</IfModule>
Any idea on why these aren't behaving as expected?