/* File........ parser1.lex 
 * Contents.... Exemple of small parser usin LEX 
 *
 * compilation: 
 *    flex parser1.lex 
 *    gcc -o parser1.exe lexyy.c
 */


/* ---------------- Definitions space ----------------- */
%option noyywrap
%{
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

%}


/* ------------------- Rules space -------------------- */
%%

^aa[ab]*$       {printf("\nThe match was : %s", yytext);}
.              {}

%%

/* ----------------- User code space ------------------ */
main()
{
  printf("Listing matches for 'All words starting with aa'.\n");
  yylex();
}