How to write a Flex code for matches protocol (http, https), domain name and optional port number, and path of the URL

sample input:

http://google.com
https://google.com:6060
https://google.com:6060/gemin
google.com:6060/gemin

sample output :

valid URL
protocol:http
domain name:google.com

valid URL
protocol:https
domain name:google.com
optional port number:6060

valid URL
protocol:https
domain name:google.com
optional port number:6060
path:gemin

Invalid URL

this is the code that i have written

%%file task1.l

%{
#include <stdio.h>
%}

%option noyywrap

%%

(http|https)://([a-zA-Z0-9.-]+)(:([0-9]+))?(/[^ tnrfv]*)? {
    printf("valid URLn");
    printf("protocol:%sn", yytext);
    printf("domain name:%sn", yytext + 7); // Skip "http://" or "https://"
    if (yytext[strlen(yytext) - 1] == '/') {
        printf("path:/n");
    } else if (yytext[strcspn(yytext, "nrtfv:")] == ':') {
        printf("optional port number:%sn", yytext + strcspn(yytext, ":") + 1);
        printf("path:%sn", yytext + strcspn(yytext, "/"));
    } else {
        printf("path:%sn", yytext + strcspn(yytext, "/"));
    }
}

.|n    { printf("Invalid URLn"); }

%%
int main() {
    yylex();
    return 0;
}

there is an error while compile the code,

task1.l:9: unrecognized rule
task1.l:9: unrecognized rule