Write a validation function to check a password between 6 to 20 characters which contain at least one numeric digit, one uppercase and one lowercase letter code example
Example: password validation with regular expression in javascript
var strongRegex = new RegExp("^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[!@#\$%\^&\*])(?=.{8,})");