title: Need a Regular expression to validate comments in the webpage
body: <p>Need a regular expression to check if webpage has special characters in the comments field.
  Comments should only have characters,numbers and  @ = - ' " . i inside the comments.
  I am using C#.net to check it </p>
  
  <p>THis is the code I have and it does not work</p>
  
  <pre><code> if (!Regex.IsMatch(comments.Text,@"^[a-zA-Z''-'\s]$"))
   {
       lblError.Text = "Please Check your Comment.";
       return false;
   }
  </code></pre>