title: adding regular expression to form_validation in codeIgniter
body: <p>I have number of forms with same structure. They all are same for user data. the id for these forms are addComment1, addComment2, addComment3, and etc.
  I want to define form validation for each of them. but i don't know their numbers. I want to use regular expression for defining them in form_validation.php. They all have the same structure and form_validation function is same for all of them. How can I use regular expression to do it?</p>