title: How to allow double quotes in regular expression?
body: <p>I have a textbox :</p>
  
  <pre><code>&lt;asp:RegularExpressionValidator ID="ValidateTitleCharacters" runat="server" 
      ValidationExpression="^[a-zA-Z0-9@+'.!#$',:;=/\(\),\-\s]{1,255}$"
      ControlToValidate="title" Text="You have entered a character(s) that is not allowed in the title."
      ErrorMessage="You have entered a character(s) that is not allowed in the title." /&gt;
  </code></pre>
  
  <p>I want to allow " character also. How can I modify the regular expression string???</p>
  
  <p>I tried this: </p>
  
  <pre><code>&lt;asp:RegularExpressionValidator ID="ValidateTitleCharacters" runat="server" 
      ValidationExpression="^[a-zA-Z0-9@+'.!#$'\",:;=/(),\-\s]{1,255}$"
      ControlToValidate="title" Text="You have entered a character(s) that is not allowed in the title."
      ErrorMessage="You have entered a character(s) that is not allowed in the title." /&gt;
  
  &lt;asp:RegularExpressionValidator ID="ValidateTitleCharacters" runat="server" 
      Validat‌​ionExpression="^[a-zA-Z0-9@+'.!#$',:;=/()(""),\-\s]{1,255}$"
      ControlToValidate="title" Text="You have entered a character(s) that is not allowed in the title."
      ErrorMessage="You have entered a character(s) that is not allowed in the title." /&gt;
  </code></pre>
  
  <p>Both attempts are breaking the string.</p>