Write a LEX program to check for valid E-mail id.

Code:

%{

#include<stdio.h>

int flag=0;

%}

%%

[a-z . 0-9]+@[a-z]+".com"|".in" {flag=1;}

%%

int main()

{

yyin = fopen("input.txt","r");

yylex();

if(flag==1)

printf("Valid Email Id\n");

else

printf("Not Valid Email Id\n");

}

int yywrap()

{

return 1;

}