Case option is used to change case of certain characters by count. For example, it can be used to capitalize the first two characters of a string.
Example:
case%%upper,2
The above prints a text like test@testing.com as TEst@testing.com.
Example:
case%%lower,2;upper,1;lower
Make the first 2 characters lower case, the following 1 character upper case and all following characters lower case.
Goepower prints as goEpower
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