ASPNET Regular Expression for validating Password field

Shown below is the Regular Expression to validate the following Password requirements:

 

·         Password is at least 7 characters in length

·         Password contains at least one non-alphanumeric character

 

 

<asp:RegularExpressionValidator ID="revValidatePwd" runat="server" ControlToValidate="txtNewPwd"

ErrorMessage="Password must be 7 characters in length and include one non-alphanumeric character."

ToolTip="Password must be 7 characters in length and include one non-alphanumeric character."

ValidationGroup="ChangePwdValidation" ValidationExpression="^(?=.*(\W)).{7,}$">*</asp:RegularExpressionValidator>