/* this is a test
 * c file  /* with an embedded comment */
 * in the middle
 *
 */

int main(void)
{
   int a;
   int b;
}

##</code><code>##

$var =~ s/abc[^xyz]*?def//;

##</code><code>##

/* this is a test
 * c file  
     /* with an embedded 
      * multiline 
      * comment 
      */
 * in the middle
 *
 */

int main(void)
{
   int a;
   int b;
}