syntax: lua: correct the word boundaries on standard library functions

Functions such as "io.close" should only be highlighted when the
package name ("io") is a word by itself, otherwise code such as
"fooio.close" gets unexpected partial highlighting.
Signed-off-by: Tom Levy <tomlevy93@gmail.com>

syntax/lua.nanorc

@@ -21,16 +21,16 @@ color brightyellow "\<(io|math|os|string|table|coroutine|debug)\>\."
 color brightyellow "\<(_G|_VERSION|assert|collectgarbage|dofile|error|getfenv|getmetatable|ipairs|load|loadfile|module|next|pairs|pcall|print|rawequal|rawget|rawset|require|select|setfenv|setmetatable|tonumber|tostring|type|unpack|xpcall)\s*\("
 
 # Standard library
-color brightyellow "io\.\<(close|flush|input|lines|open|output|popen|read|tmpfile|type|write|stdin|stdout|stderr)\>"
-color brightyellow "math\.\<(abs|acos|asin|atan2|atan|ceil|cosh|cos|deg|exp|floor|fmod|frexp|huge|ldexp|log10|log)\>"
-color brightyellow "math\.\<(max|min|mod|modf|pi|pow|rad|random|randomseed|sinh|tan)\>"
-color brightyellow "os\.\<(clock|date|difftime|execute|exit|getenv|remove|rename|setlocale|time|tmpname)\>"
-color brightyellow "package\.\<(cpath|loaded|loadlib|path|preload|seeall)\>"
-color brightyellow "string\.\<(byte|char|dump|find|format|gmatch|gsub|len|lower|match|rep|reverse|sub|upper)\>"
-color brightyellow "table\.\<(concat|insert|maxn|remove|sort)\>"
-color brightyellow "coroutine\.\<(create|resume|running|status|wrap|yield)\>"
-color brightyellow "debug\.\<(debug|getfenv|gethook|getinfo|getlocal|getmetatable|getregistry|getupvalue)\>"
-color brightyellow "debug\.\<(setfenv|sethook|setlocal|setmetatable|setupvalue|traceback)\>"
+color brightyellow "\<io\.(close|flush|input|lines|open|output|popen|read|tmpfile|type|write|stdin|stdout|stderr)\>"
+color brightyellow "\<math\.(abs|acos|asin|atan2|atan|ceil|cosh|cos|deg|exp|floor|fmod|frexp|huge|ldexp|log10|log)\>"
+color brightyellow "\<math\.(max|min|mod|modf|pi|pow|rad|random|randomseed|sinh|tan)\>"
+color brightyellow "\<os\.(clock|date|difftime|execute|exit|getenv|remove|rename|setlocale|time|tmpname)\>"
+color brightyellow "\<package\.(cpath|loaded|loadlib|path|preload|seeall)\>"
+color brightyellow "\<string\.(byte|char|dump|find|format|gmatch|gsub|len|lower|match|rep|reverse|sub|upper)\>"
+color brightyellow "\<table\.(concat|insert|maxn|remove|sort)\>"
+color brightyellow "\<coroutine\.(create|resume|running|status|wrap|yield)\>"
+color brightyellow "\<debug\.(debug|getfenv|gethook|getinfo|getlocal|getmetatable|getregistry|getupvalue)\>"
+color brightyellow "\<debug\.(setfenv|sethook|setlocal|setmetatable|setupvalue|traceback)\>"
 
 # File handle methods
 color brightyellow "\:\<(close|flush|lines|read|seek|setvbuf|write)\>"