This Regular expression is used to create strong password.
It will allows to enter at-least 1 upper case letter.
It will allows to enter at-least 1 lower case letter.
It will allows to enter at-least 1 number or special character.
It will allows to enter at-least 8 characters length.
<body> <form id="form1" runat="server"> <div> <asp:TextBox ID="PasswordTextBox" runat="server"></asp:TextBox>
<asp:RegularExpressionValidator ID="PasswordRegularExpressionValidator" runat="server" ValidationExpression="(?=^.{8,}$)((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$" ControlToValidate="PasswordTextBox" ErrorMessage="Invalid password"> </asp:RegularExpressionValidator> </div> </form> </body>
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