In this article I have given some combination of Regular Expressions along with ASP.Net RegularExpression Validators, so that it will help users implement different sorts of Password Policy in their websites
For Minimum and Maximum Length Validations you can refer the article TextBox: Minimum and maximum Character Length Validation using ASP.Net RegularExpression Validators
 
 
Minimum 8 characters at least 1 Alphabet and 1 Number
<asp:TextBox ID="txtPolicy1" runat="server"></asp:TextBox><br />
<asp:RegularExpressionValidator ID="Regex1" runat="server" ControlToValidate="txtPolicy1"
    ValidationExpression="^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$" ErrorMessage="Password must contain: Minimum 8 characters atleast 1 Alphabet and 1 Number" ForeColor="Red" />
 
Valid Password Examples: pass1234 OR PaSs1234 OR PASS1234
 
Minimum 8 characters at least 1 Alphabet, 1 Number and 1 Special Character
<asp:TextBox ID="txtPolicy2" runat="server"></asp:TextBox><br />
<asp:RegularExpressionValidator ID="Regex2" runat="server" ControlToValidate="txtPolicy2"
    ValidationExpression="^(?=.*[A-Za-z])(?=.*\d)(?=.*[$@$!%*#?&])[A-Za-z\d$@$!%*#?&]{8,}$"
    ErrorMessage="Minimum 8 characters atleast 1 Alphabet, 1 Number and 1 Special Character" ForeColor="Red" />
 
Valid Password Examples: pass@123 OR PaSS#123 OR PASS@123
 
Minimum 8 characters at least 1 Uppercase Alphabet, 1 Lowercase Alphabet and 1 Number
<asp:TextBox ID="txtPolicy3" runat="server"></asp:TextBox><br />
<asp:RegularExpressionValidator ID="Regex3" runat="server" ControlToValidate="txtPolicy3"
ValidationExpression="^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$"
ErrorMessage="Password must contain: Minimum 8 characters atleast 1 UpperCase Alphabet, 1 LowerCase Alphabet and 1 Number" ForeColor="Red" />
 
Valid Password Examples: PaSs1234 OR pASS1234
 
 
 
Minimum 8 characters at least 1 Uppercase Alphabet, 1 Lowercase Alphabet, 1 Number and 1 Special Character
 
<asp:TextBox ID="txtPolicy4" runat="server"></asp:TextBox><br />
<asp:RegularExpressionValidator ID="Regex4" runat="server" ControlToValidate="txtPolicy4"
    ValidationExpression="^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*?&])[A-Za-z\d$@$!%*?&]{8,}"
ErrorMessage="Password must contain: Minimum 8 characters atleast 1 UpperCase Alphabet, 1 LowerCase Alphabet, 1 Number and 1 Special Character" ForeColor="Red" />
 
Valid Password Examples: PaSs@123 OR pAss@123
 
 
 
Minimum 8 and Maximum 10 characters at least 1 Uppercase Alphabet, 1 Lowercase Alphabet, 1 Number and 1 Special Character
 
<asp:TextBox ID="txtPolicy5" runat="server"></asp:TextBox><br />
<asp:RegularExpressionValidator ID="Regex5" runat="server" ControlToValidate="txtPolicy5"
    ValidationExpression="^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*?&])[A-Za-z\d$@$!%*?&]{8,10}"
    ErrorMessage="Password must contain: Minimum 8 and Maximum 10 characters atleast 1 UpperCase Alphabet, 1 LowerCase Alphabet, 1 Number and 1 Special Character"
ForeColor="Red" />
 
Valid Password Examples: PaSs@123
 
 
 
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