Regular Expression for password strength validation

Shown below is the regular expression for password strength with n number of digits, upper case, special characters and at least 6 characters in length.

(?=^.{6,25}$)(?=(?:.*?\d){2})(?=.*[a-z])(?=(?:.*?[A-Z]){2})(?=(?:.*?[!@#$%*()_+^&}{:;?.]){1})(?!.*\s)[0-9a-zA-Z!@#$%*()_+^&]*$

Explanation:

• (?=^.{6,25}$) -- password length range from 6 to 25, the numbers are adjustable
• (?=(?:.*?[!@#$%*()_+^&}{:;?.]){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