It might be useful on the password generation form to have an option when generating a new password for a site that already has a password to make the new password have the same form as the old password.
By same form, I mean that the new password would be the same length as the old password, have digits in the same positions as the old password, have letters in the same position and same case as the old password, and have punctuation in the same place as the old password, and would use the same punctuation as the old password.
For most sites this would almost always result in a new password that follows whatever password format rules the site enforces, as long as they have not changed the rules since the old password was generated.
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