Asp.Net :RegularExpressionValidator to Validate MaxLength of TextMode="MultiLine" of textbox

In this post, I am discussing RegularExpressionValidator. And I am using validation expression for the multiline textbox. But this is validated on the server side.

       
<div class="col-md-12">
    <div class="col-md-4">
        Comments<span style="color: Red;">*</span>
    </div>
    <div class="col-md-6">
        <asp:TextBox ID="txtComments" runat="server" TextMode="MultiLine" ClientIDMode="Static">
        </asp:TextBox>
        <asp:RegularExpressionValidator runat="server" ID="RegularExpressionValidator3" 
            ControlToValidate="txtComments" ValidationExpression="^[\s\S]{0,100}$" 
            ErrorMessage="Please enter a maximum of 100 characters"
            Display="Dynamic" ValidationGroup="valSubmit"></asp:RegularExpressionValidator>
    </div>
</div> 
 

In the above validation expression ValidationExpression="^[\s\S]{0,maxlength}$", the max-length that you define as per your database table is required. This validation is valid for this expression on the server side.

In the previous post, I discussed the JQuery function to Validate the MaxLength of TextMode="MultiLine" of the textbox.