Do you mean the regex to validate the password while the user sets a new one or the logic to generate a new password when the user wants to reset it?
As far as I know Confluence has no password policy except that it can't be empty. For better password control there was the User Security Management plugin from Adaptavist, sadly it is no longer being actively maintained.
To generate new passwords Confluence uses java.security.SecureRandom to generate a random sequence of bytes.
Hope this helps
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