%{
#include <stdio.h>
%}
 
/* Definitions */
VOWEL      [aeiouAEIOU]
INTEGER    [0-9]+
VERB       [a-zA-Z]+ing
 
%%
 
{VOWEL}        { printf("Vowel: %s\n", yytext); }
 
{INTEGER}      { printf("Integer: %s\n", yytext); }
 
{VERB}         { printf("Verb: %s\n", yytext); }
 
[ \t\n]+       ;   /* Ignore whitespace */
 
.              { printf("Unknown: %s\n", yytext); }
 
%%
 
int main() {
    yylex();
    return 0;
}
 
int yywrap() {
    return 1;
}
 

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