Update words.x

Author: PiotrJustyna

examples/words.x

@@ -1,6 +1,17 @@
--- run with:
--- alexScanTokens " 123   abc "
--- for example
+-- this is intended to be a performance test of an alex-generated lexer
+-- * run with /usr/dict/words or equivalent, depending on your os, e.g.:
+--   * mac os: /usr/share/dict/words
+--   * alpine linux: available as a package
+--     (https://pkgs.alpinelinux.org/packages?name=words&branch=edge&repo=&arch=&origin=&flagged=&maintainer=)
+--     and when installed, available here: /usr/share/dict/ (the directory contains multiple languages)
+-- * to generate lexer:
+--   alex words.x
+-- * to scan a basic string with the generated lexer using ghci:
+--   $ ghci
+--   ghci> :l words
+--   ghci> alexScanTokens "word1 word2" (produces: ["word1","word2"])
+-- * to run the performance test as intended, compile the lexer into an executable and run with:
+--   time ./words.bin +RTS -s < /usr/dict/words
 {
 module Main (main) where
 }
@@ -10,7 +21,7 @@ module Main (main) where
 words :-
 
 $white+			;
-[A-Za-z0-9\'\-]+	{ \s -> "word: " <> s }
+[A-Za-z0-9\'\-]+	{ \s -> s }
 
 {
 main = do