How to Restrict input length of TextArea

Some times it is necessary to restrict user input length of textarea, it can be achieved by using Regular expression Validator,
 
Example :
 
<asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="txtGoals"
                    Display="Dynamic" ErrorMessage="Please limit to 500 characters or less."
                    ValidationExpression="[\s\S]{1,500}"></asp:RegularExpressionValidator>
 

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