How do I match empty lines with Flex?

Dear comp.compilers,


The following program matches lines in a text file, but ignores empty
lines. Is there any way I can alter it so it returns something on empty
lines?


Is there a reason .* doesn't match zero characters in this case?


%option noyywrap noinput nounput


%{
#include <stdio.h>


          char *yylval;


%}




%%


..* { yylval = yytext; return 1; }
\n { yylineno += 1; }
<<EOF>> { return 0; }


%%


int main( int argc, char *argv[] )
{
          if ( argc > 1 ) {
                  yyin = fopen( argv[ 1 ], "r" );


                  while ( yylex() ) {
                          printf( "%d: %s\n", yylineno, yylval );


                  }
          }


          return 0;
}


--
Johann | email: invalid -> com | www.myrkraverk.com/blog/
I'm not from the Internet, I just work there. | twitter: @myrkraverk
[Flex never matches an empty string.
I expect a pattern like ^\n would do what you want. -John]

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