/* File........ parser3.lex 
 * Contents.... Exemple of small parser usin LEX 
 */

/* compilation: 
 *    flex parser3.lex 
 *    gcc -o parser3.exe lexyy.c
 */


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

  int students = 0;
%}

DIGIT          [0-9]+
STUDENT_ID     [u|s]{DIGIT}{6,7}

/* ------------------- Rules space -------------------- */
%%
{STUDENT_ID}   { ++students; }
\n             { }
.              { }
%%

/* ----------------- User code space ------------------ */
main()
{
  printf("Hit ^Z followed by enter to finish\n");
  yylex();
  printf("--- Students : %d\n", students);

}