how to handle nested comment in flex

Question

I am working on writing a flex scanner for a language supporting nested comment like this:

/*
/**/
*/

I use to work on ocaml/ocamllex that supp

Answer 1

I resolve this problem by using yy_push_state , yy_pop_state and start condition like this :

%x comment 
%%
"/*" {
  yy_push_state(comment);
}
{
  "*/" {
    yy_pop_state();
  }

  "/*" {
    yy_push_state(comment);
  }
}
%%

In this way, I can handle any level of nested comment.