phoneNum.l

%{
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>

	int longest = 0;
	char *word = NULL;

%} 
%option noyywrap
match ^([abctuv])+$

%%

{match} {
	if(yyleng > longest) {

		if(word == NULL) {
			free(word);
		}

		longest = yyleng;
		word = (char *) malloc((yyleng + 1) * sizeof(char));
		strcpy(word, yytext);

	}
} 

\n { }
. { }
%%

int main(int argc, char *argv[])
{
	
	yylex();

	printf("Last four digits: 0282\n");
	printf("Word: %s\n", word);
	
	return 0;

}