source: vendor/flex/2.5.33/examples/fastwc/wc1.l

/* First cut at a flex-based "wc" tool. */

ws    [ \t]
nonws [^ \t\n]

%option main noyywrap
%%
        int cc = 0, wc = 0, lc = 0;

{nonws}+        cc += yyleng; ++wc;

{ws}+           cc += yyleng;

\n              ++lc; ++cc;

<<EOF>>         {
                printf( "%8d %8d %8d\n", lc, wc, cc );
                yyterminate();
                }