Answer Posted / kamalakannan.a

<asp:regularexpressionvalidator id="regExpDate"
runat="server"

ValidationExpression="^\d{2}[\/-]\d{2}[\/-]\d{2,4}$"

ErrorMessage="It is not a valid date"
ControlToValidate="txtpatientvisitdate"
EnableClientScript="False"
Display="Dynamic"></asp:regularexpressionvalidator>

Kamal..

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