%{
#include <stdio.h>
#include <string.h>
%}
 
%%
 
^[+]?[0-9]{1,4}[\s-]?[0-9]{10}$ {
    printf("Valid Mobile Number: %s\n", yytext);
}
 
[a-zA-Z_][a-zA-Z0-9_]* {
    printf("Valid Identifier: %s\n", yytext);
}
 
^(https?|ftp):\/\/[^\s\/$.?#].[^\s]*$ {
    printf("Valid URL: %s\n", yytext);
}
 
^(0[1-9]|[12][0-9]|3[01])\/(0[1-9]|1[0-2])\/[0-9]{4}$ {
    printf("Valid Date: %s\n", yytext);
}
 
^(0[0-9]|1[0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])$ {
    printf("Valid Time: %s\n", yytext);
}
 
.|\n { /* Ignore other inputs */ }
 
%%
 
int main() {
    printf("Enter text to validate (Ctrl+D to end):\n");
    yylex();
    return 0;
}
 

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