Change password for mysql user

The password for the database user.

Passwords have to adhere to following rules:

<ul><li>Between 8-20 characters.</li><li>Must be a mix of letters and digits.</li><li>Must contain at least one digit (0-9).</li><li>Must contain at least one letter (a-z).</li><li>Cannot contain spaces.</li><li>Cannot contain characters: * € $ & + } { ' " \ </li></ul>