password regex or code example

Example 1: RegExp validation for password explained

r'^
  (?=.*[A-Z])       // should contain at least one upper case
  (?=.*[a-z])       // should contain at least one lower case
  (?=.*?[0-9])      // should contain at least one digit
  (?=.*?[!@#\$&*~]) // should contain at least one Special character
  .{8,}             // Must be at least 8 characters in length  
$

Example 2: Password RegExp

"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$"

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