Expression or reg-ex for javascript or adobe livecycle tools

Question

What will be the expression for restricting a user to enter either 5 lines or 375 characters in a scrollable text field?

I tried theese:

([A-Z])\\

Answer 1

Try this:^((.+\n){0,4}.+|.{1,375})$

$(document).ready(function() {

  $("#text_string").focusout(function() {
    var res, text_string = $("#text_string").val();
    if (text_string != null) {

      res = text_string.match(/^((.+\n){0,4}.+|.{1,375})$/);
      console.log(res);
      if (!res) {
        $("#text_string").val("");
      }
    }
  });

});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<textarea name="" id="text_string" cols="30" rows="10"></textarea>