title: RegEx Max and Min length characters for a Text Box
body: <p>I use Asp.net and C#.</p>
  
  <p>I need force the User to add in a TextBox Control only between 4 and 128 characters text.</p>
  
  <p>I would like to use a ValidationExpression Property for a Validation Control.</p>
  
  <p>Could you point me out a correct <strong>Regular Expression?</strong></p>
  
  <p>Notes: I'm using this code right now, but it seems not working properly if there are double spaces or break line in the TextBox</p>
  
  <pre><code>ValidationExpression="^.{4,128}$"
  </code></pre>
  
  <p>Thanks for your time on this!</p>