nginx: change regex patterns to non-capturing for speedup

nginx/conf/cache-busting.conf

@@ -5,6 +5,6 @@
 # Read also this: github.com/h5bp/html5-boilerplate/wiki/cachebusting
 # This is not included by default, because it'd be better if you use the build
 # script to manage the file names.
-location ~* (.+)\.(\d+)\.(js|css|png|jpg|jpeg|gif)$ {
-   try_files $uri $1.$3;
+location ~* (.+)\.(?:\d+)\.(js|css|png|jpg|jpeg|gif)$ {
+   try_files $uri $1.$2;
 }

nginx/conf/cross-domain-fonts.conf

@@ -1,5 +1,5 @@
 # Cross domain webfont access
-location ~* \.(ttf|ttc|otf|eot|woff|font.css)$ {
+location ~* \.(?:ttf|ttc|otf|eot|woff|font.css)$ {
     add_header "Access-Control-Allow-Origin" "*";
 
     # Also, set cache rules for webfonts.

nginx/conf/expires.conf

@@ -36,7 +36,7 @@ location ~* \.(?:css|js)$ {
 
 # WebFonts
 # If you are NOT using cross-domain-fonts.conf, uncomment the following directive
-# location ~* \.(ttf|ttc|otf|eot|woff|font.css)$ {
+# location ~* \.(?:ttf|ttc|otf|eot|woff|font.css)$ {
 #  expires 1M;
 #  access_log off;
 #  add_header Cache-Control "public";

nginx/conf/protect-system-files.conf

@@ -1,9 +1,9 @@
 # Prevent clients from accessing hidden files (starting with a dot)
-location ~* (^|/)\. {
+location ~* (?:^|/)\. {
     return 403;
 }
 
 # Prevent clients from accessing to backup/config/source files
-location ~* (\.(bak|config|sql|fla|psd|ini|log|sh|inc|swp|dist)|~)$ {
+location ~* (?:\.(?:bak|config|sql|fla|psd|ini|log|sh|inc|swp|dist)|~)$ {
     return 403;
 }