How to change default constant package name from the src?

[whorohitkumar]

Whenever im changing package/class name i can see that its renaming it to constant names like: com -> p4d236d9a and same with other package/class name i know that we can use -o ClassRename 2times to make changes in that random package name. But i wanted to play with codes specially while renaming the class/package name can u tell me that exactly where and what i have to make changes for making changes with default renaming of the class/package name. Im guessting that we have to make some changes in utils.py file which contain some RegEx. Looking for your further guidance. Thanks