ASP.NET Password Strength Regular Expression

ASP.NET Password Strength Regular Expression. Customize n numbers of upper case, digits, Special characters. Shown below is the regular expression for password strength with n number of digits, Upper case, special characters and at least 12 characters in length. ? <span style="font-size: 9pt;">(?=^.{<span class="code-digit"><span style="background-color: white; color: navy;">12</span></span>,<span class="code-digit"><span style="background-color: white; color: navy;">25</span></span>}$)(?=(?:.*?\d){<span class="code-digit"><span style="background-color: white; color: navy;">2</span></span>})(?=.*[a-z])(?=(?:.*?[A-Z]){<span class="code-digit"><span style="background-color: white; color: navy;">2</span></span>})(?=(?:.*?[!@#$%*()_ +^&}{:;?.]){<span class="code-digit"><span style="background-color: white; color: navy;">1</span></span>})(?!.*\s)[<span class="code-digit"><span style="background-color: white; color: navy;">0</span></span>-9a-zA-Z!@#$%*()_+^&]*$</span> Explanation: (?=^.{12,25}$) -- password length range from 12 to 25, the numbers are adjustable (?=(?:.*?[!@#$%*()_+^&}{:;?.]){1}) -- at least 1 special characters (!@#$%*()_+^&}{:;?.}) , the number is adjustable (?=(?:.*?\d){2}) -- at least 2 digits, the number is adjustable (?=.*[a-z]) -- characters a-z (?=(?:.*?[A-Z]){2}) -- at least 2 upper case characters, the number is adjustable