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Unable to detect "#" as special key (Regex Asp.net)

I am new to Asp. I have a problem using regex to validate password input. Here's the regex

<asp:RegularExpressionValidator ID="Regex1" runat="server" 
                    ErrorMessage="Password must contain: Minimum 8 characters atleast 1 UpperCase Alphabet, 1 LowerCase Alphabet, 1 Number and 1 Special Character" 
                    Font-Italic="True" Font-Size="Small" ForeColor="Red" 

                    ValidationExpression="^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*?&amp;])[A-Za-z\d$@$!%*?&amp;]{8,}"
                    ControlToValidate="TextBoxNewPassword" Display="Dynamic" />

When I entered "Hamlida123 #" the regex did'nt allow it. How to solve this?

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You need to specify the `#` character specifically in the regular expression, for example:

ValidationExpression="^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*?&amp;#])[A-Za-z\d$@$!%*?&amp;#]{8,}"


Demo

Based on your current regex, I am assuming that you only allow some non-word characters, and therefore you will need to list every valid character in your regex as shown above.

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