title: Custom Error message for minLength Knockout Validations
body: <p>I am working with knockout validations . I want to display custom message for min and max length .I have tried with some options and I cant able to achieve it.if anyone achieved it already, please share me how I can do that.</p>
  
  <p>here is what I am trying right now.</p>
  
  <pre><code>var viewModel = {
      firstName: ko.observable().extend({
          minLength: [
              3,
               'Please enter Valid number']
  
          , maxLength: 10
      }),
  }
  </code></pre>
  
  <p>Do I have to really go for the RegEx for this.</p>